So I was doing the Big Dig, and I got to the part where you clear the subway tunnel of ghouls, and then you're supposed to blast one of the walls. Sonya just stays at the entrance to the subway, and when I activate the wall Mel calls her over and then she gets stuck hovering in the ground on the way to the wall, and won't move and won't blast the wall. I reloaded from where we entered the subway tunnels and it happened again. I tired hitting her and shooting at her but it has no effect at all.

Sometimes you have to talk to the guy for it to keep going