plecos can live a long time out of water.. more than most fish. and they can survive some of the nastiest crap water too..
one of the plecos i used to have was found in a puddle in a tank that someone put out for the trash.. the guy grabbed it and washed it off in the sink and put it in his aquarium. i got him and a red devil when i bought the aquarium.
oh no...thats horribl. In the canals here ive seen plecos leap pretty high ot of the water and make big splooshed while fishing, but i dont know why. I know sometimes they come up for air and maybe they were herrassed. Although my cousin has gone through about 10 plecos lost to africans and none jumped out tough..weird. sorry for ur loss