People have seemingly forgotten that characters can get stronger over time, and PL's aren't locked into one spot the moment you are born.
Escanor here was very obviously less skilled in using his power then he is later. His weakness makes perfect sense unless you try to think of...
Watch this loss of immortality turn out to be something that's a non issue like "Ban wont live for literally forever now, but he will still live into an old age and can still regenerate from injuries" or something.
I am aware.... which is why I said what I said. I don't really get the point of this response.
He is going to be in there for a few hours, or about 180-200ish years. Not a full day since he still has to get back with MEl's emotions, and get them to him, before Eli dies.