25 Sept 2006
Responding to a creature's activated ability being activated by moving Detainment Spell onto that creature won't affect the ability that was just activated.
25 Sept 2006
Morph isn't an activated ability, so Detainment Spell doesn't prevent face-down creatures from being able to turn face up.
25 Sept 2006
Detainment Spell prevents mana abilities of the enchanted creature from being activated.