This reminds me of the classic Ivey vs. Jackson hand (talk about a game of chicken). However, I think it's worth noting that both 4c5c and 9c7c make a straight flush here, that might be on their minds aswell, given that none of them is likely to have the Ac.
he doesn't build the pot, so we remove some hands, and street by street (turn and river) we can pick more information about his hand and runout, you have to be a bit experienced and studied to to that! Example. You are bigblind with T8s UTG open, he bets on 8JQ, you make the call, turn is a 9 that opens Flushdraw, you check your straight, he checks, river 2. He doesn't have a straight, he is capped. it's very UNLIKLY That a straight isn't betting turn, with all 2 pair i can have!