Can you discharge a firearm in the following scenarios?

Scenario 3:
No, you cannot discharge a firearm. While they have threatened to kill you, you are 10 meters away behind a security gate. This distance and barrier likely negate an imminent threat to your life, which is generally required to justify the use of lethal force.

Scenario 4:
Yes, you can discharge a firearm. Both burglars are armed and aimed at you, and they are advancing without a barrier between you. This constitutes an imminent threat of death or serious bodily harm, justifying the use of lethal force for self-defense.