In Chapter 22, the Questers are ambushed by Rats on their way to find Gregor's Dad. Gregor was frantically trying to save Boots, but Ripred refused to let him go. Temp and Tick were at the back - very close to the Rats attacking them. Temp put on a burst of speed and reached the other side with Boots just as Tick sacrificed herself to save her princess.
NO WARRIOR! STAY HERE!
The leader was fast approaching Tick. Gregor was panicking - she wasn't close to him! Tick and Temp were his only hope of saving his sister!
The rats and Temp fell from the bridge into the churning rapids below, saving the Questers on the other side.