I'm not a fan of "more" skill proficiencies with Lore but at least, Cutting words is great.
You can use your reaction during your turn (yes, like your actions and BA) to use it. On top of that the effect of the feature last for one full turn. It's a very powerfull debuff.
I haven’t seen anything show up in the combat log, though maybe I’ve missed something. What you’re describing is what the tooltip says, but the ability might be completely broken for all we know.
Also a reminder that it doesn’t work on crits. Those hit no matter what, so kiss your bardic die goodbye.
