The word pointing, in this stage direction, means <u><em>to mark, to direct.</em></u>
Explanation:
In the sentence "<em>himself pointing to the room above</em>", the author intends to <em>direct</em> the view upstairs, where the room is. The character points out with the finger probably to the room where "<em>he</em>" is. <em>To point</em>, in this case, means <em>to mark</em>, <em>to lead</em> the view to the direction where "<em>he</em>" went.