This is a FANTASTIC multiplayer card. An incredibly powerful tool that gives you an exclusive type of action compression useful mostly in a very particular circumstance.
The scene that I am referring to is the big moment where you engage the big-boss. The fat big bad with a health pool dependent on player count, a guy too large for a single investigator to take on unaided or just some moderately large monster that you happen to run into.
Let me explain: Often in multiplayer you will find yourself up against some threat that your limited number of actions will prevent from killing in one round, either the foe is standing a couple locations away, engaged with somebody else, or just outright too healthy to die in a single round. This card lets you:
- A, do what you want to be doing (killing this enemy).
- B, save the evade action to ensure that this boss doesn't just kill you.
All of this is compressed, in a single action, that is probably easy for you to strength buff and max out since you're the designated boss-killer. Oh and you get a +1 on the attack attempt too.
I think I've now mentioned all that this card has to offer, compress an evade action into your attack action to lay down the hurt on a major scenario threat. It's better in multiplayer than single-player due to the significantly increased health pools, this card effectively buy's you the breathing room you need to, without pause, work on that massive health pool.
Edit: In multiplayer you can also use Stunning Blow to dislodge a friend in trouble, a friendly William Yorick or "Ashcan" Pete running up and knocking out the thing holding up the clue dude can really grease things along.