Yeah, I'm with EF on this last point.
Narrative/Intent is about giving a flavorful idea of your action, but you also have to state the mechanics that you are trying to pull off.
"I throw a punch at the guy...hoping to knock him out of the train." That's a good start, but still needs to be followed up with something like, "I'm going to use an Effect die to cause knockback (a complication?) and another Effect die to cause Stress."
Narrative and Intent...flavor and mechanics. You need them both to really describe your action/reaction.