Pre-prot

From Guild Wars Wiki

Pre-protting means casting defensive (often Protection Prayers, like Spirit Bond) spells and possibly defensive Spirits (like Shelter, Displacement, Union) before someone is actually being attacked, and is useful to prevent massive damage before it happens. For example, if an enemy uses a Lightning Orb and it connects it will deal around 100 damage. If Protective Spirit was cast before Lightning Orb connects, the damage would be cut down to 10% of the max health of the target, so more around 50-60 damage dealt.