Boltgun know that they can't hold there. They have too few weapons against such tank in front of them. And if research have made progress, there is probably quad mechs, long range artillery who will take them down once someone have planted a laser targeting device.
Reaching behind his back, he activates his backpack, materializing a rocket launcher. He calls for that rebel who lost his weapon to load it for him.
"What is your name anyway ?"
"Martin, sir!" answers the rebel.
Grabbing Alexander by the shoulder he whisper in his ear, in order to not panic the other mens here.
"We are going to die in here. If you want, you can lead the remaining mens inside this building to find a way out. There is still a few second before the tank gets here."