There's just like-pure rage in his eyes-and a tiny bit of fear, like Lukas is in there trying to get back to normal. He flexes his claws
He just growls, starting to get closer
(We all know he's actually about to piss himself-)
"Grrrr..."
He gets on all fours, pacing towards Baku menacingly
He's a big boi in this form, so he paces on all fours up to Baku, fangs bared, growling.
He stops suddenly, trying to hold himself back. He's shaking a little from the effort.