My proposed level two skill (essentially, the alternative version of Quick Draw):

[i]Showdown[/i] - Pierce gains the [i]Showdown[/i] buff. Pierce enters a state of heightened alertness. When Pierce is next targeted by an attack, Pierce shoots first, dealing damage to the attacker using Pierce's Attack stat. Provided the attacker is still conscious, the attacker's attack then proceeds as normal. This buff expires after its effect takes place. This buff does not stack with itself. [color=fff200]Energy Cost: 5[/color]

Should there be some sort of turn limit on its duration as well (if so, how long?)? Or is it fine?

Also, with Quick Draw, there is an ambiguity in its wording, one which I'd like to sort out. Would I, or would I not, be allowed to trigger Quick Draw multiple times on the same turn? Each use would, of course, use energy, but maybe using it multiple times on the same turn may be considered too powerful. I'd like to get a verdict on this before I try to use it as such.