Ok, here me out...
Barney got at least 18 bullets if there's only one bullet in the gun already and the only other mag he has is to his left on the table. that means he gotta only shoot headshots which is going to cost 3-4 headshots to kill each zombie, due to Barney dealing more long range weapon damage the more closer he is to the enemy, and if we are also assuming he's on hard difficulty. If Barney is quick enough he could slightly walk to his left, pickup the mag, reload his pistol costing him roughly 2 seconds also which at this point the zombie on the floor would have finally gotten up. I don't think the zombie behind him will be able to walk between the getting up zombie's hitbox and the bookshelf as the gap seems too narrow, meaning he will only be able to start walking towards Barney as soon as the zombie in front of him finishes his animation. this should give barney time to start firing his gun to start dealing headshots. the chances of him missing a headshot are next to none in this scenario as again he is up close to the zombies and also he has fire arms training as he is well known to be a security guard. the time it takes for him to fire another bullet after another will take around a quarter of a second meaning the time it will take to kill the two zombies that are inside the room with him will be 1.50-2.00 seconds. if he is lucky he wont be damage by one of the zombies. however, if he does he will most likely not die as it wont be enough to kill his due to it have been dealt by the second zombie which would have been shot twice already and barney would be able to squeeze in the last headshot out before taking damage a second time. once the zombies in the room have been killed he will easily kill the two zombies that are nearly done climbing the counter. Leaving barney hopefully with at least two bullets left and hurt but alive. which he will afterwards be able to use the health-charger on the wall over the dead scientist to regain some health back.
nice
Ok, here me out... Barney got at least 18 bullets if there's only one bullet in the gun already and the only other mag he has is to his left on the table. that means he gotta only shoot headshots which is going to cost 3-4 headshots to kill each zombie, due to Barney dealing more long range weapon damage the more closer he is to the enemy, and if we are also assuming he's on hard difficulty. If Barney is quick enough he could slightly walk to his left, pickup the mag, reload his pistol costing him roughly 2 seconds also which at this point the zombie on the floor would have finally gotten up. I don't think the zombie behind him will be able to walk between the getting up zombie's hitbox and the bookshelf as the gap seems too narrow, meaning he will only be able to start walking towards Barney as soon as the zombie in front of him finishes his animation. this should give barney time to start firing his gun to start dealing headshots. the chances of him missing a headshot are next to none in this scenario as again he is up close to the zombies and also he has fire arms training as he is well known to be a security guard. the time it takes for him to fire another bullet after another will take around a quarter of a second meaning the time it will take to kill the two zombies that are inside the room with him will be 1.50-2.00 seconds. if he is lucky he wont be damage by one of the zombies. however, if he does he will most likely not die as it wont be enough to kill his due to it have been dealt by the second zombie which would have been shot twice already and barney would be able to squeeze in the last headshot out before taking damage a second time. once the zombies in the room have been killed he will easily kill the two zombies that are nearly done climbing the counter. Leaving barney hopefully with at least two bullets left and hurt but alive. which he will afterwards be able to use the health-charger on the wall over the dead scientist to regain some health back.
I aint reading allat
but that's gmod not half-life