Reviewing the play, what is so sad is the Browns had Watt double teamed with Treeter on Watt's right shoulder and Teller on Watt's left shoulder they had Watt's progress up field 'stoned'.
Teller looks to his right to see it there is anyone there to block, losing contact with Watt, leaving Treeter who remained in contract with Watt's right shoulder but only for a split second.
Bitonio was bull rushed and shoved all the back into Mayfield's face, causing him to avoid Bitonio's man, moving toward the line of scrimmage on the left side...Watt makes on move around Treeter and there is no one to protect Baker who is running left looking down field when Watt grabs Mayfield's left leg..Mayfield fumbles as he crashes down on his left shoulder.
Not what I would call a good attempt at 'protecting' our QB with our 3 best OLineman LG, C & RG getting beat and allowing their QB to get killed by a Cardinal DLineman who refused to give up on the play.