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It's useful to have an ace in the hole.

This dialog can be found in Witches of the Mist, an episode of Star Wars: The Clone Wars, between Savage Oppress and Count Dooku:

Savage: How does one defend against such power?

Dooku: A wise master does not reveal all his secrets at once. In due time, my apprentice.

In the "Rule of Two" style system, it's very useful for a Sith Master to have techniques available to them which are not available to one's apprentice; Sith Holocrons are available to teach any techniques one's Master neglects during one's training. Considering the shearsheer power produced by Force Lightning, it's probably safe to bet that Masters hold out on their apprentices. "Shorting out Vader's life support" was just a convenient excuse.

In Legends, it's implied that Force Lightning is one of those skills that require complete mastery of the Force, a willingness to bend the fabric of the universe to your will, and only the most powerful force users would be able to use it (and usually only the Sith would dare) (Darth Plagueis). If you're willing to accept this, it's additional support as to why Maul didn't use it; he was powerful, but not Palpatine Powerful.

It's useful to have an ace in the hole.

This dialog can be found in Witches of the Mist, an episode of Star Wars: The Clone Wars, between Savage Oppress and Count Dooku:

Savage: How does one defend against such power?

Dooku: A wise master does not reveal all his secrets at once. In due time, my apprentice.

In the "Rule of Two" style system, it's very useful for a Sith Master to have techniques available to them which are not available to one's apprentice; Sith Holocrons are available to teach any techniques one's Master neglects during one's training. Considering the shear power produced by Force Lightning, it's probably safe to bet that Masters hold out on their apprentices. "Shorting out Vader's life support" was just a convenient excuse.

In Legends, it's implied that Force Lightning is one of those skills that require complete mastery of the Force, a willingness to bend the fabric of the universe to your will, and only the most powerful force users would be able to use it (and usually only the Sith would dare) (Darth Plagueis). If you're willing to accept this, it's additional support as to why Maul didn't use it; he was powerful, but not Palpatine Powerful.

It's useful to have an ace in the hole.

This dialog can be found in Witches of the Mist, an episode of Star Wars: The Clone Wars, between Savage Oppress and Count Dooku:

Savage: How does one defend against such power?

Dooku: A wise master does not reveal all his secrets at once. In due time, my apprentice.

In the "Rule of Two" style system, it's very useful for a Sith Master to have techniques available to them which are not available to one's apprentice; Sith Holocrons are available to teach any techniques one's Master neglects during one's training. Considering the sheer power produced by Force Lightning, it's probably safe to bet that Masters hold out on their apprentices. "Shorting out Vader's life support" was just a convenient excuse.

In Legends, it's implied that Force Lightning is one of those skills that require complete mastery of the Force, a willingness to bend the fabric of the universe to your will, and only the most powerful force users would be able to use it (and usually only the Sith would dare) (Darth Plagueis). If you're willing to accept this, it's additional support as to why Maul didn't use it; he was powerful, but not Palpatine Powerful.

1
source | link

It's useful to have an ace in the hole.

This dialog can be found in Witches of the Mist, an episode of Star Wars: The Clone Wars, between Savage Oppress and Count Dooku:

Savage: How does one defend against such power?

Dooku: A wise master does not reveal all his secrets at once. In due time, my apprentice.

In the "Rule of Two" style system, it's very useful for a Sith Master to have techniques available to them which are not available to one's apprentice; Sith Holocrons are available to teach any techniques one's Master neglects during one's training. Considering the shear power produced by Force Lightning, it's probably safe to bet that Masters hold out on their apprentices. "Shorting out Vader's life support" was just a convenient excuse.

In Legends, it's implied that Force Lightning is one of those skills that require complete mastery of the Force, a willingness to bend the fabric of the universe to your will, and only the most powerful force users would be able to use it (and usually only the Sith would dare) (Darth Plagueis). If you're willing to accept this, it's additional support as to why Maul didn't use it; he was powerful, but not Palpatine Powerful.