Seems standard to me. 9BB going into the river. It's unlikely for him to raise with a worse hand, other than a bluff, which is probably also unlikely for an unknown. However it's a big pot, I just don't like b/f, but I don't have good reasons, just intuition, feels wrong. I don't really like b/c either. So I check/call. Hope he bluffs the river w/ a busted draw or has 88.