Assuming unknown enemies of unknown capabilities can't find a way to do something in an unknown period of time is a stronger assumption than anything I'm making.Every case has to be evaluated on its own basis. In case of cyberdevils, yes, there is a point to keeping them secret. Them not being secret limits their utility strongly, harms our reputation, and opens a number of ways to counter them. In case of BSM... Ok, let's model the situation - people observe that Molly periodically dumps water on her head to no visible effect. Assuming this gets back to our enemies (that's already a strong assumption), what can they learn from it, and what can they do about it? They can hypothesize that water / being wet is somehow either necessary for us (false), or beneficial for us (true to an extent). What can they do about it? They can try to deny us access to it - very hard to do in a way that's not already an attack anyway. They can try to poison the water / substitute it for something else - useless against us, and likely cost. They can... I am drawing blank on further suggestions.
My point is - not only is it unlikely that us using BSM will leak from this specific incident, even if it does, it doesn't give our enemies actionable intel that harms us.
It gives them a direction to dig in, potential new attack surfaces, things to look out for indicating that we are preparing to or are otherwise in the middle of doing something interesting, and a roughly accurate data point to plan around.
In terms of direct counters there are plenty they could try. For example, by getting a water elementalist to water bend it off, some sort of desert spirit to tap us with a desiccation curse, or a pyromancer to dry us with fire.
That aside, no one competent is going to hang a plan around a guess; they'll try things to tilt the odds without trapping themselves and learn from their attempts. Note that each of the probes you described would immediately reveal a new aspect of the charm.
We can't stop that completely but we can make it more complicated, less certain, and generally harder to do reliably.
It's like armor; it can't completely stop you from getting stabbed or shot, but it's way better than running around buck naked and asking people if that mole looks cancerous to them in the middle of a fight.
We just have to keep some armor up at all times because what we leak now is leaked forever.
And again, we're lucky that in this case we can make full use of our abilities and remain reasonably safe with relatively little effort. It's not like I'm suggesting we refuse to use charms in front of people we intend to leave alive or something ridiculous like that.
In most of the scenes involving taking boats to demonreach Harry mentions that casting across the surface of the lake makes things more difficult by a noteworthy degree.Water really doesn't hinder magic over much. Sudden unexpected deluges does, like breaking a major water line. Little Chicago would be completely unviable if water was an actual problem. Hell the first book is all about a minor talent exploiting storms power to super charge their magic.
It doesn't stop anyone in those fights because they're mostly people who are badass enough to shrug it off, but it's still worth noting Harry is saying that. It's like hearing a professional body builder in the top 10% of his industry in terms of pure muscle power call something kinda heavy.
Edit: corrected phone posting related typos.
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