[Avodah] Ownership ?

[Rich, Joel]

Reuven lends shimon a glass vase and tells him he can keep it as long as he wants and if by some chance he doesn't return it not to worry because Reuven is mochel in advance for that possibility.  On his way home, shimon stops at the light where levi, busy talking on his self phone, knocks shimon over and the vase breaks. To whom, if anyone, does levi pay the value of the vase, and why?
KT
Joel Rich
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