Why doesn't water get inside ?

This was the question came to my mind when I saw this experiment. Settings are very simple. We have a glass bowl containing water. Now a candle is lit and made to sit on the empty outer cover of a bottle.( bottle is not there, only the outer cover). Now above said lit candle is made to float on the water of empty water bowl. Next what happens is interesting. Now an empty glass pipe (one side closed) is kept upside down on floating candle. Surprising thing is when this empty pipe is kept upside down, water in the outer glass bowl will not go inside the glass pipe!!! WHY???????? As I said earlier, it is an empty glass tube. So naturally air is present inside the glass tube. Now this air as it is already occupied the space inside glass tube, will not allow water to come inside. But if glass pipe is made to tilt slightly and if we allow the already existing air to go outside, then water will come inside as space is vacant now. But what happens to the already lit candle? When the empty glass pipe is kept upside down on candle in the beginning, candle will continue to glow as air is present inside the glass pipe. Since air contains 16% of oxygen which is necessary to glow, candle will go on glowing till there is oxygen inside the pipe. But when this oxygen gets empty , then candle will get blown off. At that time, same amount of water will come inside the glass pipe as the amount of oxygen used up !