What's wrong with this picture?

[GunnerBill]

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Actually as a still frame it's not obvious but despite his power plant being at zero for quite some time he's still shooting (check out my shields)!
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Quite odd.

 

[Jesters09]

There is still energy in the distributor, seen it on both sides.

 

[Jericho Mojito]

Taking out the powerplant only halves the power output and since his shields are not recharging, he may still keep firing and moving.

 

[Alex Brentnall]

0% powerplant health = 50% power. If his priorities were set up in a certain way he may still be able to run some weapons or if his modules were sub-standard yet the powerplant was maxed. Mostly NPC's cease to function with powerplant knocked out but the odd one does carry on running/fighting.

 

[aRtFuL]

OP as other said. This change has been in place since the patch when they bought he FAS and FGS in.

 

[Twinn]

Yep! You should use this knowledge to your advantage!

Use this tool and properly set your power priorities to ensure that your 3 main lifelines stay online during critical power plant failure. You want Thrusters + FSD online at all times otherwise you are dead in the water. Life support is nice... but not entirely necessary if only flying in the bubble.

Example

 

[GunnerBill]

Cheers guys, this was the first time I've seen a NPC firing back after PP =0%!
Info is good