Silent Unseen

All his amazing skill at silent unseen travel was in use tonight.

It could even be that she cast a web of magic to dull your awareness so she could slip up to you like . . . like some silent unseen mosquito."

In this latter passage there are again strong echoes of The Children of Hurin; compare a leaguer silent unseen, stealthy, beset the stranger, as of wild things wary that watch moveless, then follow fleetly with feet of velvet their heedless prey with padding hatred (p. 66, 1749 - 53)