Continue as you are, walking as silently as possible to the cavern opening to see what might be in there.
Leave the torch behind and make your way to the cave opening to see if you can detect anything.
Throw the glowing torch into the cave. It may help light the space so you can see what's in there.
Dash into the cave as fast as possible to gain the initiative to deal with raiders that may be in there.
Shout out to the raiders that they are surrounded and outnumbered, and to surrender or be killed.
Some other creative option? (please comment)