When Tyrell was standing in the doorway of the warehouse, you can clearly see he walks away along the wall after Virgil sees him. But when Virgil enters the warehouse, you can see the stairs are not near the entrance, therefore Tyrell had no floor there to take the steps that he did, he would've walked off the platform.
Althea (Anne-Marie Johnson) tells Chief Gillespie (Carroll O'Connor) at the hospital about the spinal injury "where one of the bullets hit Tyrell" (Michael Burgess). But at the old warehouse when Virgil (Howard Rollins) was struggling over the gun with his cousin, it fired only once.