Potty Training

So I'm teaching my CK class (5-6 year olds) and we are finishing up the extended version of Twinkle Twinkle Little Star when without warning my little boy Luke grabs his crotch, doubles over, and with serious intent says, "My I go to the bafwoomb!?" Now you should know that its dangerous to say yes go bathroom requests before break time. If one student goes then the rest want to hop on the band wagon and pretty soon your lesson plan falls apart because the students have found a new goal. So I usually tell students, "No, 5 minutes okay buddy."
But looking at Luke i could tell that this was no ordinary request. This was an emergency. In this dire situation I couldn't help be proud of the little guy for not breaking into Chinese and asking in English. Immediately I said, "Yes, Yes YES. GO go GO!" ...But he couldn't get up. Doubling over it seemed created the necessary pressure and was the only thing holding it back. "He yelled out “出来了!” chu lai le! Which means It's coming. I retorted. "No Luke NO! Hold on buddy!" I considered picking him up and running with him but he repeated, "CHU LAI LE, CHU LAI LE!" So, I thought better of it. Half doubled over he begins to move as quickly as possible and I'm looking everywhere for the inevitable wet spot, stream, and puddle to follow as i chased him out of the room to aid his way. But it didn't come... Something else did. Upon his exit of the door we all began to smell what chu lai le'ed.
This marks the second occasion in which a student has shat his pants in my class.