How could other breakers have been switched off when one was tripped by a short?
If you haven't yet turned them back on for some reason, it's most likely just an oopsie. There's what I call Face-Plate panel covers that don't recess or lock themselves around the breaker block nor have any lip that seats around the panel box (dumbest things ever). I &amp; many others have been caught off-guard by these swinging or just shifting enough during removal to shut-off a whole side of the panel. You really don't notice the simultaneous click if you bang the cover or are talking. Maybe you or he hit them with your elbow, but circuits don't just suddenly crave attention.