Interesting Nethgul/Blink effects

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I noticed some interesting effects from a battle with Nethgul in it:

- If the commander wielding Nethgul has quickness, then Nethgul casts two spells per combat round

- If the commander wielding Nethgul is a communion master, then Nethgul is also a communion master

- If a communion master blinks, then all the slaves blink.

No, Nethgul, NO! Bad Nethgul.

item Nethgul casting autospell Nethgul (cr1)
Autospell is Mind Burn
best Mind Burn this far, 16 7 (8 pnts)
best Mind Burn this far, 15 8 (10 pnts)
best Mind Burn this far, 20 10 (12 pnts)
best Mind Burn this far, 22 11 (71 pnts)
best Mind Burn this far, 22 12 (72 pnts)
best Mind Burn this far, 24 12 (77 pnts)
spellscore, Mind Burn score 74 (boost 96 scorat 0)
Eval: Mind Burn score 77 (fat 5)
castspell: cnr869 spl647 (Mind Burn) vis0 x24 y12 spldmg1010
vis 0 xvis 0
blastsqr: unr21915 x24 y12 aoe0 dmg12 eff2 spc1082282112 as10204 al9
  affectvic vic25690 hv0
hitunit 21915 25690 dmg12 spec1082282112 ba1
  spec_mr pen 12 mr 15 (unr 21915 vic 25690 dmg 2 eff 12)
   resisted
Autospell is Blink
castspell: cnr869 spl633 (Blink) vis0 x54 y12 spldmg30
vis 0 xvis 0
blastsqr: unr21915 x54 y12 aoe0 dmg30 eff20 spc1082146816 as60 al7
blast communion
communion member(?) 11713
communion member(?) 17269
communion member(?) 12849
communion member(?) 18463
communion member(?) 14691
communion member(?) 13940
communion member(?) 14727
communion member(?) 15932
communion member(?) 15128
communion member(?) 19197
communion member(?) 15210
communion member(?) 17973
communion member(?) 21915