Police shot dead Manchester terror attack victim...

 https://www.dailymail.co.uk/news/article-15158827/Police-shot-Manchester-terror-attack-victim-died-admit-officers.html 

Whenever someone goes into total violent mode, there is extreme danger.

https://www.dailymail.co.uk/news/article-15158833/family-manchester-synagogue-statement-terror-attack.html 

If this person was on a suicide mission, they can't be negotiated with. They would likely harm anyone trying to stop them.