Middle Earth Riddles: The Terror Continues

[Samwise]

Agh....I knew what protozoa were at one time...no, Susan, not it, but points for showing off brains at this time of night (our morning, depending where you are).

To Sam in the lead boat was given the task of watchman*. It was close to midnight when suddenly Sam cried out. Only a few yards ahead dark shapes loomed up in the stream and he heard the swirl of racing water.
(*Eh--shouldn't that have been watchhobbit?) [img]smilies/wink.gif[/img]