It could be. What you are describing is typical of someone who has just had a seizure & the disorientation period afterwards. How long is the person you are talking about incoherent or confused? Anything over 30 minutes should be a concern.
My mother has epilepsy and I have seen hundreds of seizures of different stages throughout my life and as long as the seizure itself does not last any longer than 10 minutes (usually they last between 2-5 mins, from what I've seen) you should be okay.