Why did they use the buddy system in the monkey house?

The monkey house was a dangerous place, a place of contamination. In using the buddy system, everyone had someone else looking out for them.

Keep an eye on your buddy. Never hand a used needle to another person. If a needle comes out of its cap, it goes straight into an animal. And then put the used syringe immediately into a sharps container. If you get tired, tell your supervisor, and we’ll decon you out.” He turned away from them and went in with his buddy.