A couple of people reported that he was in a bad mood beforehand. I don’t know how you tell that, but that’s what I read.
It is well known that Orca attacks on humans (at least, known attacks) are so rare as to be practically non-existent, though Orcas could very, very easily sink a boat and chow-down on its occupants any time they damn well please. But they don't, not even the "rogue" Orcas that eat seals instead of fish -- at least, they don't attack in a way that any witnesses are around to report it. A 3rd generation diver told me once of an incident in which he connected the mysterious disappearance of two kayakers with odd behavior of a couple of Orcas that he and a friend witnessed the same day, and in the same area, as the kayakers' disappearnce; Fish N Game blamed the deaths on Great Whites, but to his dying day, the diver never bought it for an instant. And he would know -- he, his father, and his grandfather had all made their livings daily in close proximity to both Orcas and Great Whites; they didn't have any illusions about the animals because if they did, they'd have been DEAD.
And Orcas, to my knowledge, haven't ever attacked commercial fishermen in a way that any Mayday calls of being attacked by Orcas get out to fellow fishermen. It simply doesn't happen, and WHY it doesn't happen is food for thought.
There is ZERO WAY IN HELL that this was misguided play. It was deliberate.