Tend our own wound at some point and get that crossbow bolt out of our arm

You pull out the silver bolt and give it to Edi.

Grab the «gypsum-bound Codex», then chase after that guy and kick his ass.
+1, but leave everybody behind: Edi is too hurt to run/fly, Kudo is too slow in armor and should stay to protect Edi and the kid. Also, instead of flat out killing him we should see if we can make him yield. He may have information that could be useful to us, like "heh, yeah, 80% of the camp will be back in about five minutes to wreck your shit" or "there's more shines thataway"

You take out the «gypsum-bound codex». It isn't very thick. Only about 30 pages. You put it in your rope reed backpack

.

"Wait here." You tell your companions.

You fly after the maceman and manage to catch up to him. You have him cornered at the river. You aim your crossbow at him and he shouts, "I yield. I yield." and throws down his iron mace.

"Answer my questions and I will spare your life, for now." you say. "Are there more bandits skulking around and are there more shinies?"

He replies, "There were only four of us. I don't know anything about shinies. Please, if you let me go I will leave The Passionate Realm and never come back."