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I will start by saying I am not a football ref. The closest thing I can equate this to is a non-lane race in track.
Two runners are running stride for stride with each other. They tangle legs and someone goes to the ground. Is it interference? The best way to judge something like this is from a straight on view. For the legs to tangle someone has to be moving into the path of the other person.
Making this a football discussion, is the WR deviating a straight path into the DB and the feet tangle, causing the WR to fall? If this is the case then I have no call because the fall was a result of the actions of the WR. Now if the DB deviates into the path of the WR and the feet tanlge, he has caused the contact (by deviating his path), and gained an advantage (causing the WR to stumble / fall). This could be called PI.
Like the other comment says HTBT to say yes of no. Also, have to have the correct angle, something replays often get, but on field officials don't always get the luxury of having.
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