@henrykez Both this and that manga (and quite a few others) are inspired by a story regarding King Arthur and The Lady Of The Lake, so that makes sense.
@Kaarme yeah, that sounds reasonable. Apologizing for dropping an axe on anothers lawn is the polite thing to do, even if you had seen with your own eyes that nothing and noone was damaged. So the same should be applicable for dropping it in someones lake, especially
when you dont have visual confirmation that none in her family or her property was hurt.