Lost Fish

[YTHunter]

So I fished LJ today, hooked up twice on something pretty good size and lost both of them after a 30 to 60 seconds fight. Reeled in my line expecting to see a bare hook or broken off flouro leader, but both times my 65lb braid was cut about 15 ft up from the hook. First time, I assumed the braid had a partial cut. Second time (on a completely different reel) I'm thinking, no way did I have bad braid on a second reel. I mean, I've never had my braid break prior to this. I'm guessing I hooked into something with sharp teeth and it doubled back and intentional cut my braid.

Any ideas?