COPS TALK! I believe her! Play back the last press briefing and listen to the guy parse his words about 1 suspect in custody. Play it several times with your eyes closed. Hear his inflection! He never said or indicated that there was only 1 shooter. He parsed and said 1 in custody. He slips and used a plural (s) shortly before that statement ( a few seconds )
If you seek truth , you will find it. If you seek confirmation bias , you will find it