Tamaki is still smiling his familiar joyous smile when he stabs Kyoya in the heart.
How oddly appropriate, Kyoya thinks, in those few, timeless seconds before white hot pain blanks out his vision and he comes to, jackknifing upwards between the still sleeping Haruhi and Johnson, their mark. He gets up and checks on the PASIV lines, stopping the hand that's trying to rub away the pain in his chest as soon as he notices it. Haruhi should be finishing up any second, the job harder but not impossible with his absence.
Sure enough, minutes later Haruhi is awake, and they quickly pack up the PASIV and leave before Johnson wakes. Kyoya doesn't ask about Tamaki.