When the retribution effect is Pain (711) and it hits, Focused Mstrike keeps swinging instead of stopping from RT lock. Is that supposed to happen?

I would think an instant-kill with another spell would halt it. I do not know about stuns.

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In an awe inspiring display of combat mastery, the Royal Jester engages XXXXX in a furious dance macabre, spiralling into a blur of strikes and ripostes!
The Royal Jester swings a war mattock at XXXXX!
AS: +458 vs DS: +382 with AvD: +36 + d100 roll: +33 = +145
... and hits for 23 points of damage!
Jarring blow to XXXXX's back.

The Royal Jester swings a war mattock at XXXXX!
AS: +458 vs DS: +380 with AvD: +36 + d100 roll: +58 = +172
... and hits for 47 points of damage!
Respectable shot to the back.
She is stunned!
A dark shadowy tendril rises up from XXXXX's skin, writhes its way up a war mattock towards the Royal Jester and lashes out malevolently...
CS: +553 - TD: +404 + CvA: -13 + d100: +72 == +208
Warding failed!
The Royal Jester contorts in excruciating agony!
... 455 points of damage!

The Royal Jester swings a war mattock at XXXXX!
AS: +448 vs DS: +358 with AvD: +36 + d100 roll: +98 = +224
... and hits for 106 points of damage!
Crushing blow to the spine!
XXXXX slumps to the ground.

* XXXXX drops dead at your feet!