"Lay on wire" refers to barbed wire, as in rolls of it used as battlefield obstacles. And when in a hell of a rush without the proper equipment or time to cut it all apart having someone dive on top of it and the rest crawl over them is not an unknown tactic, probably more common than diving on grenades.
I did not know that.
Makes Tony's comment about cutting it when the whole reason you lay on it is because you don't have *time* to cut it even dumber. So good, it went from a poorly written Cap line to a poorly written IM line. Stupid Tony.