How do you know they are unarmed? If you fire "warning shots" and they still keep coming, what do you assume?
Does it HAVE to be "imminent" danger to one's life?
When ever drafted/agreed/adopted, such laws/regulations did not anticipate what we are now experiencing. Hopefully, the new laws/regulations that PMBJ was talking about today/yesterday, will address these new circumstances . . . about which some seem to become all confused.
Do not worry - and I hope Boris will not worry - about who will (be asked to), be "squeezing the trigger" .
Oh! No, no . . . if they turn round, and go back whence they came, there is no need to waste ammunition.. . . . Slightly out of context, but that's just trying to justify brassing them up in a "shot while trying to escape" stylee.