That they were disgusted by them in the Colluseum helping each other so much the entire audience was disgusted and the Lions stayed so hungry from the little bits they attacked the Pretoria.
What happen? Combine the fact that the walls to the manege were about two humans in hight, that Romans would not touch such Slaves and find out what Räuberleiter means to draw your own conclusions.
Spartacus walked through the gate leaving a mess, so. He was Spartan, as the name sais. Little is known about his faith, bur certain is that no-one hit is face twice.