Oh hon they are scary indeed ... one of the reasons why most daycares have a 'must stay home if fever gets over 100 or 101' because the odds of this happening increase the higher it gets and they need more one on one supervision than ... however challenge is that some children can have a fever with no other symptoms so unless you happen to be snuggling them and feel them getting 'hot' they can go from being normal to seizing in a blink

I agree any child whose had a seizure the first time should be seen by a Dr and than you can talk about 'action plan' for future times about how 'long' they seize before they have to been seen by a Dr ... plus if it is a daycare child and you are 'comfortable' dealing with it or if its your own child an action plan for how to deal with the daycare kids if your child needs to go to the hospital and so forth.

Hopefully it was an isolated incident!