Coop - Challenging Nemesis - Dropped Item requires Resonances even the other player was present

I played coop with my friend he challenged his nemesis for a duel.
We defeated his Nemesis together (Party).
He then wanted to gift me the Item he got from his Nemesis.

Actual Result:
Despite beeing present when the item dropped, it required him to use 1 obsidian resonance to gift that item to me.

Expected Result:
While present when an Item drops, he should not require any resonances to gift me that item.

Best regards,
Dominic