Out grocery shopping, so rolls when I get in. I had missed that the first jump would have been a vertical despite the run up, so that's fine but a Couple of things, I'm pretty sure its not half a meter per success for a vertical jump, so long as I'm alive I make the jump in this case either way but it'd be good to know for later. Secondly, are you sure you're okay with me having a defense test when I'm in mid air?
Also as my books not to hand, do bursts have damage modifiers in 5th or only pool modifiers? Also is that only one ofuthe three shooting at me or do I need to do this in triplicate?
For the jump:
For a vertical jump, it’s the same test, but you get half a meter of altitude per hit and the maximum you can jump is 1.5 times your height.
For the defense: a) I'm not trying to kill you, despite all appearances.

b) Movement is spread across the entire combat turn, which in this case is going to be two passes for you. So, technically, you wouldn't reach the wall until sometime during the second pass (

), but I'm not going to be anal about that; I'm just going to say that you made it, but had to run through a hail of bullets to do so. Either way, you're on the ground when the shooting starts, and can react accordingly.
As to the number of people shooting: it's just the one straight ahead of you. The other two aren't shooting yet, for some reason

, and the leader hasn't had a chance to go yet. And unless I'm missing something, the firing mode only impacts your defense pool (page 178-180).