Questions about animated object

[Kulko]

The animated Object Story bane says
A random local character encounters this monster instead. If defeated, roll 1d4, then summon and encounter a boon of the corresponding type:
1. Weapon 3. Armor
2. Spell 4. Item

Now I wonder, when some other character is forced to handle the encounter who gets to summon the boon? Who gets to close the location? The character whose turn it is or the character who handled the encounter?

[Keith Richmond]

The character who handled the encounter.