[Without the addition of the salt, this situation is nothing more than slightly annoying. Untainted water would typically be beneficial; this slug knows, at this point, that it isn't going to stay that way. The possibility of escape has occurred, of course, but it's been quickly dismissed, based on certainty that it would end in no less certain death. Sorry, that means his only option left is to annoy you for as long as he can.]

Go ahead. If you're lucky, you might graze me.

[Please have an obnoxious little smile.]

Or I can start holding my breath now, if you want a head start on that drowning.

[Never mind the fact that he's starting to feel the effect of the drugs.]