What is the legal nature of the possessor's hand (possession) when the item is taken as collateral while under a guarantee obligation?

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The hand (possession) of the pawnee (pledgee) holding the collateral is one of trust (yad amanah). This is diametrically opposed to the hand of a usurper (Ghasib) or a borrower for use (Musta'ir), which is considered a hand of liability (yad damanah). The cause necessitating the guarantee (Ghasb, 'Ariyah, etc.) has ceased because the possessor is no longer acting as a usurper or a borrower for use, and therefore the guarantee liability also ceases.