[Tuna-Fish]

Tested quickly with Gandalf Parker's Mini map. Results were conclusive: When repelling, no magic effects take place, not even poisoning, regardless the hint in the manual.

Tested with:
Wine Whip
Rat tail
Fire brand
Lighning spear
Thorn spear

Wielded on a black lord (or Raterik) with lead shield (to get def down), burning pearl and a girdle of might, tested against hordes of harpies. Several succesful repels that caused only 1 point of damage were seen for each of the weapons.

Just to be sure, also tested on Vanheim Vanir with fire 9, still no effects.