Mercifully, these incidents are rare. However, close calls do happen more often than you think. Some that I have witnessed.
1. Medium sized turboprop starts taxing before engineer was clear. (Eng had to run to avoid getting hit by the prop).
2. A large four engined jet started taxiing before the all clear had been given. The two engineers that we're walking clear hit the deck and hung on to each other as the #3 engine went over them. (I understand the captain was fired)
3. Large jet twin waiting on stand for GPU to be connected with engines running due to inop APU.
One of the turnaround team walked towards the running engine, head down, oblivious of the danger. Saved by quick thinking loaders and others yelling and waving at him.
4. Similar to no.3 but a security person walked towards and past then behind a running engine. How that didn't end in tragedy I do not know.
It's dangerous out there. Be safe and never, ever rush.
A delay means more paperwork. That's all.