Hey @Hadurach!
How about this 
Hmmm… I made this with a continuous trace in mind, different than the mechanic I believe you’re going for. But then if it’s already momentary, how could you even get multiple hits in the first place 
Oh wait I got it ok, it’s for the duration of the montage yeah dunno why I confused myself so much. So yeah you’ll also need to reset the Do Once node once the attack input is no longer. (But if in the first frame it’s already impossible to get a hit then you can leave it as it is 
)