"In times of trouble, true feelings emerge!" Yan Fei muttered under his breath earnestly, "Officer Wang, it seems I really misunderstood you before. You're pretty loyal!"
Yan Fei's statement wasn't unreasonable. The words Officer Wang had just said, "I wonder how you're going to settle this one, see who you can call to get you out of this mess," combined with the action of stuffing his mobile phone into his hand, and his glance at the beaten man on the ground, left little doubt about his intention.
Now, whoever you need to call, make the call. As for who, you figure it out yourself; just let it be someone who can sort this out.
Clearly, this person doesn't need to be very capable, just capable enough to deal with the one on the ground—just send the guy to the hospital in time. With the ever-improving medical procedures, it's unlikely he'll sustain any disabilities. If both parties are willing to settle privately under these circumstances, then everyone's happy.