This anon has a theory
i have not been able to find a single eye-witness account yet, other than the rabbi that "showed up late" after all the chaos ended. and even that account the rabbi seems un-phased by the loss of life.
Chuck Diamond was a rabbi at Tree of Life for seven years.
Diamond said possibly three rabbis would’ve been inside. Rabbi Pearlman from New Light was in the basement. Rabbi Cheryl Kline was in the social hall. Rabbi Meyers, the rabbi of Tree of Life, would have been in the chapel.
“I was at home [when I found out]. I live right up the street around the corner and I started getting phone calls,” Diamond said.
Meghan Schiller: Did you ever as rabbi think that you were gonna have to deal with this?
Diamond: “I thought about it all the time, I have to tell you. When I was there, in the back of my mind, I always have the thought of something like this happening and what I would do, unfortunately, because of the world we live in.”
Schiller: “What comes to mind when you hear that President Donald Trump just tweeted about this?”
Diamond: “Well again, this is unfortunately it happens too often in this country and around the world that these things happen, so it affects us all, so I’m glad that he tweeted something and hopefully he’ll take positive action.”
President Donald Trump called the shooting a “terrible thing” and said “it’s a shame to watch.”
“It’s a terrible terrible thing what’s going on with hate in our country, and frankly all over the world and something has be done,” Trump said. “It’s just a shame to watch this and to see it for so many years, so much of it, it’s a shame.”
sauce here: https://pittsburgh.cbslocal.com/2018/10/27/heavy-police-presence-near-synagogue-in-squirrel-hill/