thats bad luck ive done almost samething cast out ,place in fav crevice ,taken to remove undersize fish off my mothers line turned around & watched it javelin out 10 or 20 mts into the ocean ,then sat & watched rod & large overhead skip across the waves till it
was out of eyesight (must of been something BIG & fast ) ,its heartbreaking but guess you wont be doing that again , proper protocol would be to leave line ready ,go for leak then come back proceed to cast and HOLD THAT ROD ive even been able to get hooks on to a bucket handle that was behind me & proceeded to throw bucket and all out into the foamy wash with KEYS for the car ,plus tackle in the damn bucket ,old man was not happy , Its happened to plenty of ppl