Kostya gave an indistinct bark of greeting when the unknown wolf brushed against him. If he was actually hunting he might have been a bit more defensive but this was just for fun so the more the merrier in his opinion!
Kostya returned the other wolf's grin as they pulled ahead of him, going for the deer's flank. Kostya gave a bark of laughter as the deer nearly tripped itself over trying to change its course away from the stranger. His eyes glinting Kostya but on a burst of sped of his own and quickly moved around to the deer's other flank, letting out a loud bark which sent it skittering back towards the other wolf. Once again the deer nearly tripped itself up as it tried to figure out which way to go, changing its course nervously one way and another and it was all Kostya could do not to fall over and start laughing.
Still, as amusing as the chase was Kostya was starting to get fairly tired; he had been chasing the deer for a fair amount of time before the stranger had joined in and while he had been working on his stamina lately he was still pretty lacking when it came to fast passed activities such as chasing. Since losing his prey would be a pretty crappy ending to a hunt, even a playful one, Kostya sped up once more, gaining some ground and moving into a position where he would have a better lunge at the deer's neck. He made the distance easily and kept pace alongside the deer in his new position, all he needed now was for the deer to move a little bit closer to him and he had it.