Sounds like First Aid did what it should do, provide first aid. You can only speculate what happened after that but they would either send you off or call an ambulance. It's perfectly possible the guest said 'nah I'm fine for now I'll just go home'. First Aid are medics at best, not doctors.
What First Aid of the park have done, according to you?
My point was that this is all 100% speculation and people shouldn't trip on their own presumptions.