I don't mean I'd stand there looking for a pulse for 7 minutes, I mean it would be pretty easy to screw this call up and delay starting CPR by that long.
You get dispatched for the seizure, get on scene and family says "she has these all the time", fire has not taken vitals and just tells you "she's been seizing since we got here, probably going to need ALS". Patient is unresponsive but breathing at ~30/minute... Cardiac arrest is probably not the first thing that comes to mind in this situation.
In school you learn CAB for unresponsive patients, so you should be checking a pulse right away... But in the real world it's easy to stray from these algorithms, especially when you're 2nd on scene and fire is giving you information, and you think you know what's going on.