I think the reason the grandpa is talking about saying goodbye is because he knows Snake Papi is using his energy to keep him alive, ╥﹏╥ he's telling MC to let him go so Snake Papi can wake up.
I think the reason the grandpa is talking about saying goodbye is because he knows Snake Papi is using his energy to keep him alive, ╥﹏╥ he's telling MC to let him go so Snake Papi can wake up.