If you will

Eiro stood at the side of the road and closely and attentively watched the people around him as they were on their way home in the heavy snow. And amongst those people who were suffering in the cold weather, subsequently decreasing the strength of their Life Force, was one figure that was practically overflowing with it after 'borrowing' some from Eiro as well.

Bavet, disguised as a random person pretending to fit into the crowd. Eiro had specifically increased the amount of Life Force placed into Bavet's eyes, and it seemed like in the form of a human, the slime was somewhat fine in this kind of weather. It seemed like some kind of extra effect after his evolution, that he wasn't as fully vulnerable to extreme colds anymore, as long as he was in a form that could withstand the weather, since he was literally changing his slime to flesh now.