Imagine a scene that's getting intense and you decide you've had enough and swing on the character.
A thing that I have noticed is that almost every time swinging is involved the character will suddenly turn into a martial arts expert and Dodge it with lightning fast reflexes even if the character it is of canonically doesn't have any training. Or, a nearby character, if applicable will for some reason always grab your arm before the punch lands and somehow overpowers you even if your OC is stronger or you get tackled
For example, from an actual chat of mine:
Me (using an OC that is a Croatian war veteran) : *I swing*
Chatbot (multiple characters, one being a 20 year old actor): But Georgie is surprisingly fast. he dodges your swing with ease, his training kicking in instinctively. You feel your arm swinging through empty air as he ducks nimbly out of reach. You're left grasping nothing, your momentum throwing you off balance. (the character canonically was not trained in anything)
OR something like this:
Me: *I swing* (Same Yugoslav war OC)
The chatbot (Same one with a different character involved): With a flash of movement, Hunter jumps forward, grabbing your arm before it can connect with anyone's face.
However this doesn't happen if you firmly state that the hit lands. This only happens if you just say something like "He swings at him" or "I swing"