[seanmcdirmid]

There is a lot of nuance there. Some soldiers were killed by protesters, but it wasn’t the student protesters rather beijingers who were pissed about the PLA coming into town (the PKU students were already mostly back in their dorms by this point). The soldiers also weren’t armed, this being early and back then they were afraid to just give the soldiers weapons (not all of the PLA agreed with the crackdown). They eventually brought in troops from further away garrisons fully armed that were less sympathetic to the protesters (local garrisons back then were staffed with soldiers from Beijing).

So your colleague wasn’t completely lying, but the truth belies a lot more intrigue. I think this is all in the wiki article.

The biggest problem (at least from the CPC’s point of view) is that the PRC completely lacked non lethal riot suppression capabilities. They literally had nothing in between just standing there unarmed and full on military assault. Afterwards, they built up the PAP (people’s armed police) very quickly, and you can see them often practicing in Beijing.