Brissett is not an easy guy to bring down.
The execution could've been better, but Brissett is a load. That's a 6'4", nearly 250 pound quarterback and he has great contact balance. To sack him, you need to hit him square. Doesn't only make him harder to bring down, but it makes it harder to line up the hit.
He replaced Sam Howell briefly last year in Washington and was immediately better than him. He's underrated.