article_snippet: Arapahoe County Sheriff Grayson Robinson would not have had time to get out of the way as Pierson entered the school and started shooting just after 12.30pm that day.
article_snippet: Arapahoe County Sheriff Grayson Robinson would not have had time to get out of the way as Pierson entered the school and started shooting just after 12.30pm that day .
article_snippet: Police said the incident had been extremely brief, lasting one minute and 17 seconds from the time Pierson entered the building armed with the shotgun, several rounds of ammunition, and three petrol bombs, to the point where he shot himself (above students comfort each other following the shooting two years ago)
article_snippet: Arapahoe County Sheriff Grayson Robinson said that Pierson legally purchased the shotgun on December 6, a full week before the incident. '
article_snippet: Arapahoe County Sheriff Grayson Robinson said that Pierson legally purchased the shotgun on December 6, a full week before the incident (above students meet with students relieved parents at a fast food restaurant across from the school following the incident in 2013)