I wish I knew for certain, dear follower.
Upon inspection the next day, I was unable to find any traces of blood or tissue, and the pokémon was able to escape into the fog nimbly enough to indicate that it did not sustain serious injuries. I just have to reassure myself that a pokémon of that size tends to be highly resilient, and if it is indeed a dragonite (and not, for example, a rather large ditto masquerading as one—or, for another example, a lesser legendary pokémon doing the same), then I have no doubt it would be powerful enough to withstand a blast of that caliber.
Should anyone be at all surprised that I am not alarmed by the fact that there is footage of this incident, it’s largely because I am fully aware that there are … people who spend quite a bit of time loitering on the neighboring beach and sea for rather specific reasons. What I’m more concerned about is the fact that many of these people film my lighthouse, yet none of them have been able to figure out what caused the blast.