use math then.
his running shot crits for about 4-5k on a pwandel.
His non buffed AA is about 1,150 on on pwandel. We have no clue how many crit attack he got, but atleast 50%. So a basic AA crit would deal ATLEAST around 1725 damage.
So basic AA crit (with just flat 50% crit modifier) = 575 damage now add the running shot bonus damage buff (280%, no one uses not atleast a didel) and you get another bonus of 3,220 dmg (based on his standard AA of 1150) added on top and b00m with some magic you average around 3795 “crit” damage. Add in all the crit attack he gains from STR and pretty much have the numbers.
If running shot bonus damage would be calculated into the crits he would atleast crit for about 5-6k.
Ofc the math isnt 100% correct since we have no idea about his gear but, in the end the result would be same, he would simply crit a lot higher with RS bonus went into his crit formular.