yeah, hotwire can die and those nod guys will try to blow the sam site also. you need to be fast, try to take out those 2 armoured personal from far away and snipe at the black hand. then only you destroy the nod buggy. hotwire won't rush tto the sam site as long as the nod buggy is there. she'll receive some hit from the nod buggy and back off so if you stay far away destroying staff, she will stay at a corner.i'm sure you can do it. i'm in the same level playing commando difficulty and facing a lot of problem on my way to destroy SSM. shooting from far is the best way to survive