But they can't, because the weapons have not enough range and if the ships are not flying forwards, they will not generate enough lift and crash down, like any WW1 or WW2 plane would! It's strafing runs or bust.Star Wars laser bolts don't travel that fast and are very visible. Open up the range and your target can dodge even without Jedi reflexes.
EDIT: My bad, poor reading. Yeah, once the ship was disabled they could have easily shot it from range.
I feel the biggest problem is not that the physics or tactics don't make sense, it's that it didn't really look good, and it would have been better to write that encounter different. Can't they come up with some other Jedi tricks for Ahsoka to show off, like mind-tricking an enemy pilot or shadow-bombing a torpedo (you know, steal from the EU, a torpedo without guidance and engines and steered to target by the force)?