The so called "witness" reports always try to reverse the cause and effect. perhaps the bulldozer attacks were also swerving to avoid stones that the bulldozer dug up. On that occasion, the police did not finish off the attacker, and he continued and murdered another civilian, leaving her baby motherless. On this occasion, the police were under threat, they had some men injured, and had to prevent further bloodshed against themselves.
Gunmen in Egypt kill guard outside Niger embassy (Reuters)
from the article: Report: Israel Police shot Palestinian instead of arresting him