All-American Barricade (Second 1.0)

American summons a barrier made out of the ground from under him, the barrier is large enough to cover two people. The barrier blocks most long-range and mid-range attacks. The barrier doesn't last long, but is effective where needed.

1) 80HP Wall
2) ???Cooldown

I'm not totally sure of a cooldown for something like this.
Quick question:

Massive 200 damage attack hits wall. Does Wall:
A. CRUMBLE BEFORE THE SWARM--and Navi behind takes 120 damage?
B. HOLD LIKE A MAN--and Navi takes no damage?

And by the way, Wooga--Sig system got overhauled. Might wanna read over the new Sig rules topic.