And?
The fight did not need to be longer.
Maul was completely consumed with getting revenge on Obi Wan, soo utterly consumed by his rage and anger against him he didnt see he was being baited by Obi Wan, who was a very different man from when they last fought in the Clone Wars. Obi Wan had grown and had years to reflect on everything he has went through and saw that he could bait Maul by using the same stance Qui Gon used on Naboo when Maul killed him.
The fight was over before it even began as Obi Wan knew he could take him out in a single set of moves to exploit Maul's weakness. Nothing flashy, just lure him in then kill him.