Seeing as guildguards tend to reflect their guild (i.e. skills/spells) it would make sense that certain guild guards would beat down certain people easier.

I think you would need to point out the races/classes/equipment of the people involved in this to make an accurate assessment.

I'm not sure of it, but remember that this guild guard may get spells like slow and other softening type spells. Those things wreak havoc with a player's strength and quickly turn the tide.