That's not how they work, they were and are used whenever you join a battlefield, whether ongoing or newly begun.
Yeah, that's why I posted this on the Feedback and Ideas forum, not the City Pub. I posted this to start a discussion on the pros and cons of the idea as well as potentially get admin eyes and thoughts on it.
Deal with it. If you can't, then cry me a river.
Not sure what prompted the aggressive response, but maybe provide some constructive criticism to the idea rather than attacking the one who suggested it.
I'll start with a question:
In your opinion, what are the downsides of limiting their usage to only new BF?
Personally, I could see someone trying to exploit this by having a friend join a BF then leaving within the first minute. Then, that original person queues, gets the confirmation, and joins the BF at the beginning without using their Prayerful Call. Rinse and repeat and now they have unlimited entrances every day. However, this could be mitigated with a system that does not use the Prayerful Call only if you join after the first 10 minutes or after a certain number of points have been scored.
I can also see an opposite argument for players who join in when the instance is over halfway completed. Leaving them little time to affect the outcome or finish their mission, thus wasting their Call for the day.