It happened the day he and Mia arrived back from their challenge.
The only people that had arrived before them were Wolf and Laura. With Greenie present as well, the five of them had gathered in the living room to relax.
They ate good food, had some drinks, and talked late into the night. In fact, it got really late, and after some time, Greenie left, already a bit groggy and sleepy.
Wolf and Laura left next, both of them already tipsy and not wanting to continue drinking. They said good night and went to their respective rooms while Mia and Reign continued drinking in the living room.
It was, in hindsight, a mistake.
They had already drank quite a bit, and should have stopped when the others did as well, but for some reason, they didn't.
Mia, for one, was drinking a bit more than everybody else and wasn't willing to simply stop. As for Reign, he merely took it as her being happy that their challenge was finished and that they were back.
