Bruce had finished talking to another business representative when he came to see Stark looking at the grandfather clock Bruce looked around to see if he was alone and came over to Stark and looked up at the clock "interesting is it not my father said  that his father had given it to him and it has been here ever since". Bruce looked at Stark he could tell that he was trying to figure something out about the clock Bruce looked around "so did you want to take me up on my offer of the tour of the manor or do you want to stay here and look at a old clock for the rest of the night". Bruce waited for Starks answer. Bruce knew that this was one of the entrances to the Batcave and right now was not the best time for it to be discovered especially with a large group of people here Bruce wanted to get Stark away from it so that he did not figure out what was wrong with the clock.