Ivan heard a noise at the base of the tree. Assuming it to be some animal, he only wrinkled his nose a bit and closed his eyes, leaning against the trunk of the tree with the intent of getting some rest before Raven arrived with his bow. But the noise didn't stop. Raising an eyebrow to himself, Ivan looked down, then screamed bloody murder. 
The mud on the ground was starting to creep its way up the tree, as if it had a mind of his own. Ivan was suddenly glad he'd had the foresight to relieve himself earlier, as he only had the one pair of pants and this would have been the end of their clean state if he hadn't acted earlier. 
Though Ivan was light for his age, he quickly got to a point on the tree where the branches could barely support his weight. He knew if he went any higher, he'd just end up falling. He knew what he had to do next. He ran across the long branch, ignoring the ominous cracking sounds, and jumped into the next tree over, just barely catching himself on a branch. He was now hanging by his hands from a branch that was just about to about to break. Not good, to be sure. He tried to see if he could maneuver himself to a different branch, but this tree was sparse and the next few branches over he couldn't even reach. "Raven!  RAVEN!! God damn it, Raven!" He cried, barely able to hold himself up.