So the idea with Hear Me Out is just this: if you can get someone to listen to you, just for a second, they're going to hesitate at least long enough to hear what you have to say, and you can at least finish the conversation.
Originally, it was going to be that as long as you had a mark on it, you couldn't be attacked by them at all, but that would either require only working on NPCs, blocking player agency, or different rules for PCs and NPCs.
I guess... "When you've drawn someone out, as long as you have at least one mark, if they're an NPC they won't attack you, and if they're a PC, they'll need to hold steady to attack you." might work.
- Alex