A sulfuric slime can sense nearby motion through vibration and air movement.

Motion Sense 60 feet

Trigger The slime takes piercing or slashing damage while touching water or mud
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Effect The slime temporarily shrinks in size as part of its body seeps out through its wounds. It thrashes in the nearby sludge, making it more difficult to determine where the boundaries of its body end. It becomes <a href="/condition/concealed">Concealed</a> and gains a +2 circumstance bonus to its AC until the beginning of its next turn.

One With the Mud

Trigger The slime takes piercing or slashing damage while touching water or mud
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Effect The slime temporarily shrinks in size as part of its body seeps out through its wounds. It thrashes in the nearby sludge, making it more difficult to determine where the boundaries of its body end. It becomes @UUID[Compendium.pf2e.conditionitems.Item.Concealed] and gains a +2 circumstance bonus to its AC until the beginning of its next turn.

Sulfuric Slime