Yes as long as the action is carried out while they are still a threat to you or yours.
You cannot do it during a retreat or with putting any form of planning into it. (well thats how I read it)
I spent 25 years in the Royal Air Force & the rules of combat where never really 100% clear on the subject of intruders etc.
You where never sure if put in the position to shoot within for instance the boundries of a U/K Station if the system would protect you or "bang you up"!