The police are quoted in this news article as saying the glass was one inch thick and double paned - sounds different than tempered or safety glass. And then the news article also goes on to share a witness account that was posted HERE. Pretty weird:
>>..Lt. Herrmann said a witness claimed Mr. Kimutis appeared to have gotten into a three-point stance Wednesday night, "like a football player," yelled "Hike!" and then charged the window, which police estimated was an inch thick and double-paned.
But a Furthur fan posting on the band's website questioned that account of the incident, which he claimed to have witnessed. The fan wrote that Mr. Kimutis had walked toward a group of people, facing the window, when he began to lift his leg and cycle his arms like a runner.
"He took two deep breaths and then lunged toward the window ... blasted through it and landed on this sidewalk below," the fan wrote.
www.post-gazette.com/pg/11091/1136194-53.stm
Read more:
www.post-gazette.com/pg/11091/1136194-53.stm#ixzz1IQLcoUq7