Badgie dies, and the spell lifts.
It happens at different rates for different people; just as the casting of the spells that mades them small affected them all in different ways, but there's no drug this time - some pass out, but not all. for some it's instantaneous - child to adult or older child in one second. For others it's slower, and the body reasserts itself and the memories return.
And apart from a few extra memories from the last few days, everyone is returned to the state in which they arrived.