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Abilities that trigger when a permanent “becomes untapped” won’t trigger if a stun counter is removed instead.

If a permanent has more than one stun counter on it, only one will be removed each time it would become untapped.

If a tapped permanent with a stun counter on it would become untapped, a stun counter will be removed from it instead. This is a replacement effect.

If untapping a permanent is part of a cost (such as that of Halo Fountain’s first ability), you may pay that cost by “untapping” a tapped permanent with a stun counter on it. The stun counter will be removed and the creature will remain tapped. However, the cost will still be paid.

Stun counters replace untapping for any reason, including players untapping tapped permanents during their untap steps.

You may target a creature that is already tapped with Impede Momentum. If the target creature is tapped as it resolves, you will still put three stun counters on it.