conducted his business as he normally would. gave no indication that anything was amiss. took time to have a meal and actually took time to go bowling. by himself. >> reporter: police say pearson was looking for a librarian and that claire davis happened to be in the line of fire. the whole incident only took about a minute and 20 seconds to unfold and he praised the deputy on duty in the school for reacting quickly. otherwise, many more people might have been killed. jim, as you know, the police believe he was actually looking for his debate team chairman who apparently had disciplined him before that and he went into the school library because the debate team leader is also the librarian. then he apparently heard this deputy coming closer and that's the moment that he shot himself. so a lot of people are saying the fact that this deputy moved so quickly could have potentially saved a lot of lives. >> thank you very much. for more on these details, let's turn to denver post reporter