RN Responsibility Refresher

Hi guys, a newbie to RN World! Just graduated and making the world a little bit better one at a time! Anyway, caught in a bit of conundrum, I hope you guys can help. Here's the story:

I work nights at my hospital and yesterday morning a patient supposedly fell to the floor. Now the nurse, which is an LPN (very important part), asked me to help the patient get back to the bed, so of course i said yes. I went into the room, asked the LPN if he fell or not and he mumbled something and we went on to put the patient back to the bed. I told him you should tell the Charge and write an incident report. Then I went on my merry way to MY 6 patients. Then, working tonight, the charge confronts me, asking me if i knew about a patient who fell and I said yes. She proceeded to ask me if I had done anything else than help the LPN, and I said no. So, for 15 minutes I am being scolded for not making sure the LPN told her and for not making an incident report. She is making an incident report NOW including my name.

Now, when she scolded me, my mind was getting pain meds for a patient, but then when I had time to reflect on it, she basically was telling me that since I am an RN, I should have been on top of the situation just because he is an LPN. She was asking me if anything was done, vital signs, paging the MD, and I am wide-eyed. I do not remember reading as one of my responsibilities as an RN to babysit an LPN. It's not like he is new, he has been working for a few years now and I just got off orientation a month ago. I'm not syaing he's a bad nurse either; he's helped me a couple times.

So, we probably would have to speak to the RN manager tomorrow, what should I do? Say? Am I liable for anything that happened to the patient? Any advice? Thanks!