Looked to me like he grabbed a handful of jersey just under his neck. You could see it bunched up there when Darnold got up.
I'm not against passing down there, but it was predictable on 3rd down. Bad snap was the bigger problem.
i'll answer my own question, hopefully Long is just having a bad day and we wont see anymore of this the rest of the season. Reminding me of Yankees catcher Sanchez not being able to catch the ball. His main job is to catch the ball. Longs is to snap the ball and hes not doing a good job of it today.