Question on Extraction on Boss Mob

Fiel doesnt extrac the pdr either how do they know the pdr too? and the hp change only by a small amount u think u can be that good on acc on estimate?

Also, Fiel does do PDR, take this for example:

수련용 티노
Level: 1
HP: 15
Physical Attack: 2
Magical Attack: 1
Knockback: 5
WDEF: 10
MDEF: 10
Accuracy: 4

The WDEF and MDEF values are PDR and MDR respectively, they just don't have a percent sign.

He doesn't usually do monster changes though because they're usually pretty insignificant, the fact that the Chaos Root Abyss monsters were changed so much is an exception that doesn't happen very often.