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.
2006-09-25 · Wizards of the Coast
Detainment Spell prevents mana abilities of the enchanted creature from being activated.
2006-09-25 · Wizards of the Coast
Morph isn't an activated ability, so Detainment Spell doesn't prevent face-down creatures from being able to turn face up.
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The CG Realm · Condition DMG