4th-and-10 from the A2. Player A1 punts with 5 seconds remaining in the second quarter. Kick returner B1 signals (with a valid signal) for a fair catch at the 50-yard line, but he is bumped at that spot by player A2 before the ball arrives. The ball then touches B1 first, and player B2 recovers the ball at the B45-yard line as time expires. What are the options for Team B?