1. Legal - legs are 'wide' but runs smack into screener's torso area anyway.
2. Fifty shades of illegal.
3. Illegal - screener would have been good but eliminated the necessary time/distance by moving forward into the defender.
As for the 2-person/3-person argument - no question 3 whistles is better...but the screens all happen directly in front of trail. Even the second one, which is blatantly illegal, the Trail sees the whole play, but passes - he even shakes his head to confirm he is passing.