1) I'm not really sure what to do here. I feel like he can mix it up and c/r twice here and probably doesn't have much of a c/c range here. I think I check turn and bet blank rivers.

2) From his sizing I feel like this is 910 or random bluff frequently. Unless there was some
timing give away I don't think I'd check back river. I wouldn't bomb it though. Just bet halfpotish maybe a bit smaller. If he insta checked river I would seriously consider checking behind though.

Not really sure how I feel about both tbh.