Checkmate, literary critics

I believe I still have the white dwarf with the battle report where Tyco got the Brain Bursta that messed up his face.

actually, he felt to the Black Rage, not to his lack of helmets. That said, captains have Iron Halos, so yeah, they can walk around helmetless, no problem... helmets do bring in drawbacks, and if you have invulsave to just one point below your helmet's save, that allows you to ignore the drawbacks of wearing a helmet...

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btw, there is historical prescedent to why a soldier would chose to remove his helmets, be it a renascense soldier opening his visor just before he reaches meele, so he can actually see the battle around him once the archers/crowwbowmen stop shooting at him (you don' shoot troops engaged in meele with your own troops, unless you are from Game of Thrones... or valhallan, I guess...), be it WW2 american rangers encroaching on german position through a forest, at night, worried their helmets will snap a branch, therefore removing their helmets so they can feel if their heads touch any branches and not snap it while they are sneaking around (though, unless you are a Raven Guard, I don't think you would care much for the later one in 40k)

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Was he Primaris? If no, then there's your answer

Commenting before the mods lock this post for being a Turning Point meme, this is the greatest day of my life.