Odin unable to be Combo'd?

[Raymeo]

Just fought Odin -- was practically standing on top of him when he popped, so I was there for the entire fight. I didn't have issues seeing him or targeting him, and he stayed pretty much stationary for the entire FATE, but I was on PLD, and for whatever reason I couldn't get a Halone combo off for the life of me. Fast Blade would cause Savage Blade's icon to glow, and then I'd hit Savage Blade and... nothing. Abilities would go on cooldown, but Halone wouldn't glow, and if I tried using Halone anyway it received no combo bonus. Rinse, repeat, a couple hundred times in a row. I'd consult the battle log to see if Savage Blade even landed, or was registered as being used for that matter, but HAH, good luck with that. I also noticed that the only way I was able to make a dent in my TP was to spam Shield Lob -- otherwise I never seemed to fall below 900, and I had no TP buffs. As a result I ended up with a Silver, despite being on top of the boss, with him visibly targeted, spamming abilities from the moment he popped to the moment he died.

Is this normal? Like, is there some mechanic I don't know about that might have nullified all of my combos? Or is this a bug that I should be reporting?