You ever notice how often headgear in games doesn’t actually protect your head or give you any additional bonus to your armor? It’s like, you don’t even need to wear it, you can just hide it if you want and still get the benefits from it. Sometimes the benefits have nothing to do with defense at all! That said… losing it does mean he can’t actually see her level/status anymore, so he has to gauge her spikes in power with intuition and other visual cues. Although, was it really just a single failed attack that snapped her out of it? Or something else or a culmination of factors even he’s unaware of? And if he hasn’t taken off his helmet to escape- how much damage would that have caused? . . . And wasn’t he covered in blood and wounds earlier?