Hell, several people even made a giant catapult on-site (props given for engineering knowledge though). What surprised me at that time watching is that the Ukrainian police were so tolerant of rocks falling on them. American police would have immediately opened fire. Of-course, that tolerance didn't last long once policemen started taking casualties.
initially it was just students who protested. peacefully. police beat them down. after this to maidan came adults (because it's not appropriate to brutalize children ) and started camping there. and later it escalated to what you wrote about when police (based on government orders based on russian suggestions) tried to disperse maidan camp.
you probably didn't watch it from the very beginning. I did. in ukrainian.
after this protests "for eu integration" moved to protests against brutality and when police escalate more it became "ant-regime" protest