Thanks for finding that, thorny! I am not skilled at finding stuff.
And given today’s GG page, it occurs to me: Higgs is way old. If he was an early Jager who went a bit strange in his making, so that he still looks pretty much like a standard human man rather than having all those so-decorative fangs, horns, claws and odd skin changes that mark more ‘normal’ Jagers, he may have been around royal courts in some unobtrusive capacity as a spy or agent rather than as a Jager, like he seems now to hold positions in several human navies or air fleets. Apparently Jagers just live until something kills them.
If he has been the Heterodyne’s spymaster for that long, and he has to be hundreds of years old, maybe thousands of years, it is quite possible that he has been around to see a Queen made before, and recognises the strangeness of the flame involved in that process? And it may take awhile for him to dig the details out of his memory, as we saw with Albia, who is well over 5000 years old, having to store her deep memory externally just because there is so much of it, and who can forget things and needs to be reminded of them, as shown in the scenes thorny posted.