LOL I have never really been afraid when fishing, but i know a mate of mine who was flounder fishing [in his waders] and a HUGE ray followed behind him and he didn’t realise it untill he suddenly started catching nothing all the flounder had gone so he decided he’d get out of the water and hed further round the bay….. Haha, rather scary to see a giant black moving blob coming towards you, needless to say he got out of the water sharpish. 
Apparently ray’s can be attracted by the flounder light?