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Let's see if I can remember this exactly as it happened....
Assume the following:
Rd.1: Paladin uses Full Move to get within 20' from Monster (oops, with 20' reach), inadvertently provoking AoO -- gets Poisoned after failed Save & loses some CON.
Rd.1: Monster attacks Paladin at 20' Poisoning him again after another failed Save; Pal loses a little more CON.
Rd.2: Paladin moves 20' into Monster to hit it (provoking AoO & failing another Save, loses more CON), uses Standard Action to attack -- uses Swift Action to Lay on Hands, neutralizing the Poison via Mercy.
Okay, according to RAW, the Paladin has to make additional Saves against the Poison each round on his turn in Initiative.
Question: Does a Paladin's Mercy during the Swift Action take place before or after the second round's new Poison Save?
If the Paladin has to attempt the Save before he is able to Lay on Hands he may fail, take more CON damage and die before his Actions on his turn in Initiative.
If the Paladin can use his Swift Action to Lay on Hands before the Save attempt on Rd. 2 of the poisoning then the Poison is neutralized and he just has to wait 'til the end of the fight for a 10 round Restoration spell to get his missing CON back.
That's not how similar poisons stack.
They increase overall duration and DC, but once poisoned, you still only check once per round on your turn(beginning I would say).
So mercy would happen after the save.