The Buffy and Angel Trivia Guide // Tranq gun

In the scene in Soulless where Wesley saves Fred by shooting Angelus with the tranquiliser gun, the stage directions were as follows:

Then, PPHHHHTT! A tranquilliser dart pierces Angelus’s shoulder. A flash of annoyance passes across his face. Then, woozy, he STAGGERS back releasing Fred.
REVEAL Wesley, halfway down the stairs, tranq gun still levelled as, PPHHHHTT! Wesley shoots another dart - this one into Angelus’s neck. Angelus goes slack and hits the ground with a THUD.