What a mess.
I'm interested in your thought process as advisor. You say you would eat the out call. So would I (and have, which is why I don't say "batter's out" any longer
). But you told him to go ahead with his reversal of the out, and then to award bases.
What led you to advise him to do something other than what you would do? As umpires, unless we're being paid to do so we should be leery about telling umpires on the field that they're wrong. Was that your thought? Or were you trying to help him find a solution that worked for him?
If he's a younger umpire, he now thinks that you would handle this situation as he did, which isn't true. I think that the right lesson here is one about "living and dying with a call," rather than thinking that there's always something you can do with runners to fix a bad call.
Turns out this might be as much of a learning experience for you as for them, jk!