First of all u should state what charms u use, becouse u need a high ar to hit a good pala( with 12+k def)
Second, yes it is possible but is not easy,, u must weit a paladin to walk or run(in that case he got lower block for 1/3) and never teleport on him while he has masive number of hammers spinning arround him this will lead u almost in to shure death.
So basically u must weit on him to do some mistakes , play defensively and try to dodg his hammers ,if he use enigma just run, if u run he can not hit u.
So actually killing a hammerdin is very hard ,it takes a lot of skills and patients.
About the summon necro? well i have never duelled that one before and personally i think it is not a suitable idea for a pvp char,, just whw on him, the monsters/golem/skeletons will barely hit u, go strait on necro and kill him.
I think u should be aware of pb necromancer they are preaty tuff and hard to beat :lol: