First thing we must do is fire the chalk-line guy for making our 3-foot runners lane 30-feet wide.
Just going strictly by the judgement posted here (and therefore assuming the ball was not within a step and a reach when F1 collided with BR), I have an easy OBS, BR to first.
No need to ask BU (or wonder about) whether runner was in "the chute" at all - it's irrelevant, and a red herring.