They just keep riding the spin until it stops.
Sometimes, the towel or shirt is comfortably pressed against the spinning cylinder. Sometimes they are falling, only to crash to the bottom of the dryer.
Occasionally, they're mixed up with a dirty old sock. Sometimes, they're with some silky unmentionables.
And, sometimes, someone might stick another quarter in the machine to keep things going.
But, eventually, the cycle will end. The dryer will stop spinning. And the clothes will be removed, fluffed, folded and put away.