Does deadly strike double the fire damage component from enchant?

I have a a5 frenzy merc, just wondering if headstriker would be OP with double damage from enchant.

Vs plague which has lower res procs

only physical damage. it does work with berserk though.

ds only works with non-physical dmg if that dmg is generated by conversion: in this case physical dmg is doubled first, then converted

Thanks for the info