Guild Wars 2

Blind affects “next” outgoing attack, if the bubble caused by, say Null Field is still present when the enemy attacks, does blind continue to reapply itself until Null Field dissipates? This obviously requires the correct traits in Illusions for blinds applied on glamours. I assume it only matters when an enemy enters or leaves the bubble, but if they stay in it it only affects the first attack.

The Blind is only applied once, on the moment the Glamour is cast.