I think mbrg is right here.
There were only five Stampeders rushing on that play. Seven guys were on the line, two dropped back. And FFS we had Grigsby in the backfield blocking too, so our protection outnumbered their pass rush 6-5.
Look at how #51 was one-on-one with the outside rusher and totally whiffed on him. He wasn't even a speed bump. This is some Boatmanesque ****.
Meanwhile on the other side of the line, #60, he's just kinda wandering, lost in space, and then he reaches out and taps the guy opposite him as if to reassure.
This looks pretty shameful for the OL here. Maybe you can fault Hall for throwing a ball he shouldn't have thrown, but you can't blame him for playing behind an LT who's more of a matador than a football player.