In "The Flash" Season 2 Episode 6, Zoom hits Barry 700 times and then parades him around Central City. When Zoom killed everyone at Jitters, he simply broke their necks. Why would Zoom waste time and energy pulverizing Barry when he could have just broken his neck?
2 Answers
If you are only now watching the show, this might be a spoiler. But it explains why he doesn't kill him.
Zoom's motivation is not to kill Barry, but to steal his Speed Force in order to add it to his own. He is addicted to getting more and more Speed Force.
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Shouldn't he be able to take over the amount of speed force Flash is tapping into if he simply killed Flash though? Although my only knowledge about that comes from an animated movie, so I might be wrong. Commented Mar 23, 2021 at 17:45
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1@Clockwork I can't remember exactly, but I think Barry has to willingly give it up to him. Basically he had to subjugate Barry to the point where he is willing to surrender. Commented Mar 23, 2021 at 19:02
Note: this is more a comment on Jack B Nimble's answer, but I write it as an answer due to spoilers.
As said in the other answer, not only
Zoom wants to steal the speed of spedsters from other universes, to be the fastest spedsters of the multi-verse
but he also needs Barry and team Flash to
restore his body damaged by a problematic early version of the Velocity serum.
In the show, Jay Garrick
is actually Zoom infiltrating team Flash to get the team's help to create the Velocity serum. He is losing his powers (life too?) and is finally saved by the Velocity 9 created by Caitlin.