"This poor guy was right behind me when he was hit in the head with a police projectile. He went down hard and did not get up," Finneburgh wrote.
At first, Doctors told Olsen's friends that he was in critical, but stable condition. Now they're being told that his skull has been fractured and his brain is beginning to swell. Neurologists are in the process of determining whether or not he will require surgery.
According to Keith Shannon, a friend who served with Olsen during his time in Iraq, Olsen was hit in the head with a tear gas or smoke canister, and he has the scar on his head to prove it.
Meanwhile, Oakland police admit that they used tear gas and baton rounds, but have denied the use of flash bang grenades. Protesters, however, say they saw police use them, and the more video that comes out, the harder it is to believe the police.
Olsen hails from Wisconsin, served tours of Iraq in 2006 and 2007, and is active in both Veterans for Peace and Iraq Veterans Against the War.
You can see a video of him collapsing and injured below.
Scientists living under an oppressive regime
decide to clinically study the founders and supporters of evil regimes to determine what common factor is at play in the rise and propagation of man's inhumanity to man.