<608/1019hp 364m 660mv 3606tnl> [6 PM-waning]
(civilized-indoor) You are affected by:
Skill: 'detect hidden' for 38 hours.
Skill: 'heightened awareness' for 38 hours.
Spell: 'bless' modifies save vs spell by -4 for 21 hours.
Spell: 'bless' modifies hit roll by 2 for 21 hours.
Spell: 'protection from evil' for 19 hours.
Skill: 'martial trance' for 9 hours.
Skill: 'impale' modifies dexterity by -6 for 7 hours.
Skill: 'impale' modifies strength by -6 for 7 hours.
Skill: 'endure' modifies armor class by -38 for 5 hours.
Skill: 'endure' modifies save vs paralysis by -9 for 5 hours.
Skill: 'endure' modifies save vs spell by -19 for 5 hours.
Skill: 'bind wounds' for 1 hours.

<608/1019hp 364m 660mv 3606tnl> [6 PM-waning]
(civilized-indoor) 

You pay the Afskyelige healer 900 copper coins.
The Afskyelige healer closes his eyes for a moment and nods at
you.
Your wounds rapidly heal.

<658/1019hp 364m 660mv 3606tnl> [6 PM-waning]
(civilized-indoor)

// Ok here I got 50hp instead of 100 (50%). 
// And dam reduction I got is protection_evil which 25%.
// Should I be getting 75hp in this situation?

From the Martial Trance helpfile: "While in the trance, the
assassin may shrug off blows and terrible damage to their person which would kill or incapacitate a lesser being. Pain means nothing to an assassin in the perfect calm of the martial trance."

That equals dam reduction.

Protection won't interfere with healing.

Kastellyn the Devourer of Magic, Lord of Legends

>Protection won't interfere with healing.

Actually, it does somewhat, irrespective of the alignment of the healer. (Assuming it doesn't come from your class/cabal abilities.)

However, the most important factor here is that the Afskyelige healer is evil and has the same problems healing that evil PC healers do.