I would definitely be interested in that. Empathy like Lexa's is one of the ways his power can be combatted! Damen doesn't currently know that. He doesn't know much of how that power is supposed to work, and probably won't until he's able to trigger it for the first time.

And I'm up for them training together! He'd be less worried about hurting her than others if she has a form of invulnerability, and he already thinks she's from a society closer to his own. He thinks she's got a lot of sense.