(...) A ward against magic creates an immobile, faintly shimmering magical sphere (with radius 10 feet) that surrounds the caster and excludes all spell effects of up to 1st level. Alternatively, the caster can ward just the target and not create the radius effect. For each additional level of spells to be excluded, increase the Spellcraft DC by +20 (but see below). The area or effect of any such spells does not include the area of the ward, and such spells fail to affect any target within the ward. This includes spell-like abilities and spells or spell-like effects from magic items. However, any type of spell can be cast through or out of the ward. The caster can leave and return to the protected area without penalty (unless the spell specifically targets a creature and does not provide a radius effect). (...)
Based on this section of the Ward seed in the Epic Level Handbook, would a ward limited to a single target disappear as soon as the target moved? Or could they move around while retaining the benefit?