Yeah, monsters can counter the long-distance physical attack of Thibault's Trompement, and I get damaged by the counter attack. from 3 spaces away. Thought you ought to know.
They can actually counter all of the weapon based area attacks. This makes me very cautious about using Ragnar's Meteor.
They can do everything an attack can but do not apply your weapon damage or procs on any but the main attacked target in front of you. So they can crit, be countered and dodged. I'm not sure whether they can be resisted though, I think so.