He grimaced as his bare feet sank into the cold, wet grass and mud squelched between his toes. Still, the sun was shining now; there was a large open patch above town, although most of the surrounding sky was still overcast. He could see dozens of winged ponies in the air near the clouds, flitting around in the clear air. One in particular caught his eye when it rapidly streaked from one pony to another, leaving a rainbow contrail behind. Maybe if they move through the air quickly, they move around the moisture—there must be a lot of it still up there, since it just rained—and that's what causes it.