In Agents of Shield S02E10, Trip returned to the alien city without Fitz and Simmons and, more importantly, without the hazmat suit to disarm the bombs. How did he not get infected with whatever that befell Mack in the episode earlier?
Coulson, Raina, and Skye also went to the alien city without any extra protection and didn't get affected. Nonetheless, as far as these alien/Kree matters were concerned, those 3 had legitimate reasons to be special. What was exceptional about Trip that gave him a similar immunity?