Had this short-haired woman in the black leather armor simply gifted Fang Mu some unwanted items and resources, Fang Mu would have reciprocated, but he wouldn't have been grateful.
Dragon pearls can only be produced within the body of a dragon beast that has entered the Sequential state.
This level of resource is beyond Fang Mu's current understanding; he doesn't know how much these dragon pearl fragments are worth.
Nor does he know which type of dragon beast they originated from.
Dragon pearls generated within different dragon beasts vary greatly in price.
Therefore, Fang Mu is unsure of the potency of the Life Elixir he should reciprocate with.
If this were a transaction, he could directly take out the trapped dragon wooden box he just obtained from his Starlight and examine the dragon pearl fragments inside.
However, it would be rude to examine a reciprocal gift directly in the presence of others.