Interesting video I stumbled on by Sarin Gas Attack, who gets all credit to this finding.
They matched Karen Nielsons 911 call from the cafeteria and Patti Nielsons 911 call from the Library based on background dispatch noise.
From Karen Nielsons 911 call, they matched it to the cafeteria footage.
Through this matching it was discovered that Patti Nielson's call is likely 1 minute earlier than what is commonly known, and the shooters likely had entered the library at 11:28 instead of 11:29.
Original Thread:
[You must be registered and logged in to see this link.]Video:
[You must be registered and logged in to see this link.]Not sure if this has been posted here before but I would love to hear your thoughts on it. Definitely a major discovery.