i think its neither, the institution was jus playin him and he didnt fall for it at the end. why u ask?
1. just cos theres a storm dont mean ppl become sick.. he had a headacke when they gave him water.. they drugged him. so he ended up having migrains etc bad dreams..
2. the nod at the end was for him to leave, the 2 guards stepped a side and he walked off to go home, not to the tower.
however, the begining of the film, it could be that the guards r uneasy cos they know leo, is the real thread, the biggest in the island, which explains the tension at the start there..
truthly i dont no, im still tryina figure this shit out lmao.