VS during active seizures

You can't get a BP during a seizure. Your main responsibility is to keep the patient safe by removing any thing close that could harm the patient. Although frightening to observe, usually seizures are self limiting. Patient may be confused after the seizure, called the post ictal period. No, you are not lacking in skills. I'm surprised that the charge would even try to get a BP during a seizure! You might want to review nursing care of the actively seizing patient.

I see absolutely no reason to try and get a BP during a seizure, which is basically impossible as Boomer said. The only vitals signs you need are skins (pulse if you want). If they are cyanotic, (central or peripheral) cold, hot, clammy? Is the pulse regular or irregular, bounding, thready, etc. Everything I need to know to affect my treatment during and immediately following the seizure comes from just looking at and touching my patient.

Add me to the list of people who doesn't see a reason to even try to get a BP during a seizure. I worked pediatric neurology for the first 5 years of my career. Exactly 0 times in those years did we ever try to get a BP on an actively seizing patient.

ETA: Once, I had a patient who started seizing due to increased ICP from hydrocephalus/her EVD was blocked. We did take her BP (widening pulse pressure = an ominous sign when dealing with ICP) but only AFTER we gave her ativan to stop the seizure and it did stop.

I'd be more interested in why the patient was seizing than his blood pressure.

You don't take a BP mid seizure; you keep the pt safe, administer Ativan, and ensure that the pt is breathing.

I started my career on a neuro floor, and have since worked in two SICUs which included neuro. I've never attempted a BP -- nor have I seen my colleagues -- on a seizing pt.