Crumbling
Rodney couldn't keep his thoughts straight. He had initially seen the Nak's hand as nothing more than a valuable body part, but the current state of the lab depicted a very different truth.
The hand shone with azure light while floating at the center of the broken machine. The glass shards on the floor reflected that halo, almost encircling the body part into a bright crown, and smoke came out of the spots where the lightning-like flares had landed.
The hand wasn't a piece of merchandising that Rodney could sell anymore. It had transformed into an alien threat brimming with enough power to kill him on the spot. Retreating was the only option, but his companion had different ideas.
Khan inevitably saw more than Rodney. His sensitivity played a big part in the matter, but his mutations added a deeper layer of understanding to the situation as a whole.