Invisible Woman, passed out villains, etc
Susan's job seemed easy, compared to everyone else's. Stand near the Washington Monument, make a forcefield, keep it up. Simple, and without people bashing against her forcefield, it was easy, but sticking to the objective meant watching everyone else fight.
It would be a lie to say that she wasn't concerned about Johnny. He was strong, but truth be told ... he was kind of stupid and would probably manage to find the worse possible enemy to fight. But she stayed, for now, using one wall of the monument as part of her forcefield, opening holes in it whenever someone approached with a villain to toss in.