You move forward

You believe You're able to easily get past the trap, using both your skills as a thief, and of course the cheat sheet that is above your head. So you began to move forward.

You skillfully precede, with each step touching the stone plates that won't trigger the trap. You kinda get cocky abit as you move forward, this is too easy you think. You so much, you as finish tracking across the trap hall, you just trigger one of the plates for fun. You dodge the iron ball, and just watch it smash into a wall.

With a cocky smirk on your face, you continue to forward to the end of the hallway. To find...