This damned thing came close to killing him before he'd even realized what was happening; might this be the end of Roger the Bard, Gentleman Adventurer?

Hardly! The foul beast had taken the noble heroes by surprise, but by luring the fell creature to dry land the tide of the battle could easily be turned. One need only be more clever than his foe to come out the victor, even when caught unawares. Roger is indeed quite clever, and with impossible speed aided by a charmed necklace Audrey had given him, he rushes to Mina. Even when the charm's magic runs dry he continues on a few more paces, for if he did anything else before healing himself in his grievously injured state he would most assuredly die horribly.

Spoiler: Crunchy info
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Oh god 2 HP
Swift action using chronocharm to move 15 feet south into Mina's square

Move action to continue moving another 20 feet south along the causeway

Free action because he has a +1 or higher BAB to also draw his wand of silverbeard during his move action

Standard action Cure light wounds on himself, (1d8+5)[7]. Come on, big dice