You shake the bars: "Hey, guard, I've lost my memories!  Do you know who I am?  Do I ask this a lot?"

The guard turns to look at you, begins saying "You ...!", then suddenly vanishes in a burst of dense dust.  Their sword, keys and garments drop to the ground with loud "Clang!"s.  Some of the dust blows down the hallway, other drifts over the torches and strengthens their flames amidst sparks.

In the distance, you hear echoes: "Hey!"  "What was that?" "Better go check it out ..."

What do you do?

> take keys