User blog comment:Mckrongs/Lagiacrus Subspecies Discussion/@comment-5020152-20120425210358/@comment-1011548-20120425212113

I believe you can fight him underwater for about 30 seconds in Area 11 when he's weak and trying to get to Area 12. In the video I saw (I believe it was GSD993's) he just spat a couple of lightning balls at the hunter (whilst underwater) and then carried on swim-limping away.