These screenshots were taken from the sample saved state that is included with TM package.

Here we see Ragnar (the cyan token in the botton), a good cleric, entering an evil cathedral. All inside areas are hidden from him.

Ragnar moves and enters the main cathedral room. This area is revealed to him as he steps over it.

Now, Ragdar explores the room on the left.

But, at this very moment, two orcs (brownish tokens) appear! Ragdar quickly casts Flame Strike (red area marking) hitting the two foes!