He nods at the other ken. This has evolved mostly into practice rather than competition, and he's okay with that. The next time Wormmon lets the ball drift Ken is there to gently nudge it back towards the little Digimon.

"You've got it, keep going." It must be hard to coordinate that many limbs... sometimes he has trouble with just four. "You're almost there."

... A little further than 'almost', but he's trying to be encouraging.