We'll have to agree to disagree.
It was an ill-advised challenge, and my heart was in my mouth for a moment, but I do think a red would have been extraordinarily harsh.
I can only imagine that he means the challenge by JPVH on the half way line, in the first half. He got a yellow for it, and I think there was a brief check, but the replays showed that whilst he lunged in a bit, he made barely any contact at all.