How was Ezra aware of this fact?

Question

Be careful! Major spoilers ahead if you have not seen the latest Rebels episode Twin Suns¹.

During this episode

Obi-Wan kills Darth Maul

and as a consequence Ezra says to his friends back at Chopper base:

We won't be seeing Maul again.

This is of course true, but how could Ezra know this? He left Obi-Wan and Maul before the fight. Yes, he took his ship, but this does not mean that

Maul could not leave the planet with another ship, given that he survived the fight with Obi-Wan.

Have I missed something obvious on screen?

Answer 1

_{Quite speculative, so maybe not a good answer. But in my opinion based on reasonable assumptions.}

At the end of the episode, we see Obi-Wan watch Lars call Luke back to the house. In this scene he is riding his Dewback.

However, in the scene just before Maul's death, Obi-Wan sends Ezra North on his Dewback as that is "his way home".

From my understanding of the link between these two scenes. Obi-Wan went north to catch up with Ezra, led Ezra to Maul's ship and sent him on his way. In the process, informing him of Maul's death and Ezra freedom from his influence.