Shots fired from either side aren't currently confirmed. Morton County states that a .38 was pulled by a protester while Standing Rock states that an AR-15 with live ammunition was fired at the roadblock. Like I said, neither are confirmed.  

Member of DAPL Security crashed in to Oceti, main NODAPL camp, wielded an AR15, popped off a few rounds, and was arrested by BIA. Not exactly peaceful either but definitely confirmed.

You're citing the only semi-verifiable day during the pipeline protest that had aggressive tactics associated with it. Maybe pay attention to the photo of an old woman being beaten by cops for "holding a weapon" and notice the walking stick in her hands. Maybe she had a firearm or another weapon or maybe not.

Strip searches and militaristic arrest and detention tactics started at the beginning of this protest not as a result of yesterdays aggression. 

If these tactics can be used on Standing Rock, whether you agree with them or not, they can be used on you.