That grin you're getting hung up on is one second, literally like a frame in a handshake that, to me, looked completely normal for the most part. The only thing Trudeau did was brace himself from the inevitable pull, and who can blame him? I think you're giving Trump a little too much pity on this. He's not just an old man. He's an old, vindictive, petty man, among other things. You're right though, it's just a handshake. I'm just not going to feel bad that someone came along and countered his bizarre handshake-pull.

Also, sweet handstand/plank/whatever the hell he's doing on that table.