I’m not sure there was much contact if any at all before the pass hit the defender in the back. If the RB played the ball better, there would’ve been a lot of contact and the flag should’ve been thrown. Unless it’s egregious, you’re usually not gonna get the call if the ref doesn’t think you gave yourself a chance to catch the ball. I think that’s what happened to Diggs against Tampa, but it was probably egregious enough the call. But Diggs did himself no favors basically giving up on going for the ball.