Mostly because she has the upper hand in reality she is pointing it at his back where he doesn't have his light saber ready to deflect it as far as we know. Really she has the easy chance to kill him

She gave Luke a warning though, unlike order 66 when the clones just shot the Jedi in the back without warning and even at that, some of the Jedi were capable of reacting a bit before they got outnumbered and shot dead. And I'm sure Luke could dodge a couple of bullets and possible force grab her weapon lol

We all know how fast Jedi move, and there's no way she gets that close to him without him sensing her coming, unless Disney has decided Jedi can't sense people anymore. Either way, I ain't worried about Luke coming out on top of that situation.

Luke will most likely come out and escape Yeah but it looked like he was getting up from an explosion or something so was she so they are both offset and a Jedi can move fast but remember clones manage to kill Jedi from behind easily without much trouble

Hmm see to me it looked like he was just standing up from looking at something, but if he was getting up from some kind of blast in the middle of the battle that would make more sense as to why she even got that close to him without his notice. And yes the clones did kill them, but remember they also didn't hesitate they opened fire instantly and without warning. In the video it looked like she was trying to talk to him or take him prisoner, giving him time to react. Either way it's an interesting scenario, I'm very excited about the campaign, can't wait for more info on this game.