I once met an ER doctor who had been on duty in a Beijing hospital that night. He said they had injured soldiers in one ward, and injured students in another.
He said the soldiers were obviously under the influence of some kind of drug, which they had been given before the attack began or during the attack.
The soldiers that did the killing were all from parts of China far away from Beijing. They were brought in after local military units refused to fire on the students. I recall that one of the generals in charge had a daughter who was among the protestors.
[They were brought in after local military units refused to fire on the students.]
I should say “might”. Because for one dictator to seize power from another is the historical trend.
They were mountain troops and they killed the local troops who where earlier stationed there.
Kind of like the Nazi German soldiers being on meth