Mage pet exp

[Homesteaded]

I'm trying to understand the mechanics behind this. So could a mage PL someone by taking a mob to 1%, dismissing pet and having someone else finish?

If this doesn't work, does the game somehow recalculate who has done the most dmg? So let's say we have a mob with 100hp, pet 1 takes the mob to 50 hp, reclaim the pet. So the mob now has 50hp, does the mage need to do 26 dmg to get full exp? What if pet 2 took the mob down to 25hp, then was reclaimed, resummon pet 3, does the mage now need to do 13 dmg to get full exp?