I'd probably redirect without making a big deal. if he is biting at Kona he probably wants to play, and if Kona isn't reciprocating, then it's probably best to give the puppy something better to do. I'd not make it a big deal though, using something like Kikopup's positive interrupter (see her youtube page) to just move the puppy and direct them to something else. Maybe play with them, give them a toy top lay iwth, do some training. I'd generally increase the mental exercise with the puppy. Food should be worked for (training, food toys). lots of short training sessions.