The Mole said "Please don't hurt me, I may be useful one day!"
So the Rhino let him go. Later that day the Mole was digging and he felt the earth shake. He could smell gunpowder and he could hear Rhino running. Quickly he dug a trench and the hunters fell into it. Rhino ran off as fast as he could.
Later he came back and thanked Mole for waking him up.