[QUOTE=master of read;4967726]but what could he shape shift into that could do much of anything to luffy?[/QUOTE]
Suffocate him climbing into his mouth. But Luffy is so much faster that he won't even be able to touch him. However, I don't know if Luffy can even hurt Eel. Outside of BFR, Eel could just outlast him. He doesn't need to eat, sleep, breath and is immortal.