So he got the attention of a worker on the ground floor, and using sign language pointed to his eye, then his knee, and then at his hand as he made a sawing motion with his arm, to say, "I need a hand saw!"
The guy on the ground answered by taking his dick out of his pants and jerked off.
The other guy ran down the stairs meeting the guy on the fifth floor and yelled at the him, "Why the hell did you jerk off?"
The other guy replied, "I was telling you that I was coming!"