DS2 seems to have developped an "angry chimp" mode. He gets angry, but won't talk, or make any noise. He lowers his brows, sticks out his lips, and then throws things around, hits me, and bites me. He's not completely mad, he's not hitting as hard as he can, he's even a bit calm with it. And he makes no noise.
Oh, and he can laugh in the middle of it, and then get more angry, because I made him laugh!
It gets a bit difficult, particularly if he does it on the bike - having someone try to bite your arm while you're cycling in London traffic is not fun.
I think I'm making progress in learning how to get him out of it. I need to either work out the problem and talk to him about it, or just completely leave him alone.