I'm totally new to RPGs, but this game looked like a good intro. It seems really neat.
In my "play testing", I was attacking a minion group. The minion group had two minions, with say five wound threshold each. The first has four wounds from the first combat check from the first PC. The second PC performs a combat check. It succeeds with enough damage to create a critical injury. I think the result is that you apply the damage first, which is enough to destroy one minion. Then you apply the advantage, convert to a critical injury and destroy the second minion. Did I get that right?