影におどろいてしまいました。

shadow; silhouette; figure; shape; reflection; image; ominous sign; light (stars, moon); trace; shadow (of one's former self)

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to be surprised; to be astonished