The footprints go this way," said Cuddy, "and then they return. But the ones...

The footprints go this way," said Cuddy, "and then they return. But the ones coming back aren't so deep as the ones going. You can see they're later ones because they're over the top of the other ones. So he was heavier than he was coming back, yes?"
"Right," said Detritus. "So that means...?"
"He lose weight?