I found someone who took a video archive of the shooter Jerrod Ramos's Twitter account because it will be scrubbed from the internet soon. You can video the video here
https://twitter.com/astra_novae/status/1012502492846780416?s=19
https://twitter.com/astra_novae/status/1012502492846780416?s=19
https://twitter.com/astra_novae/status/1012502492846780416?s=19