Muslims are supposed to pray something like 5 times a day, and they have to kneel down to do it if that was the case, prayers could be done kneeling at their seats. I doubt there is enough room to kneel in the bathroom unless your head is in the toilet.
As you can tell, these Syrians were not frightened by anyone noticing anything. They knew they were in total control at that moment...and next time, when it's for real..they will have total control once again.