Hand on heart, I think the ref got it right but if he had given both I wouldn't complain much either. I don't think it was stonewall, in fact I think it was less clear-cut than the foul on Nemane, but you could understand it being given due to the contact.
(It looks like Cameron takes his legs but on slow mo he actually checks and the player apparently goes down under contact from - is it Baldwin? - behind him; it's very hard to see the contact that actually spills him. Not saying it is a dive but it would have been very soft to give.)

