Hitomi also needs to be told about magic so we don't have to, for example, lie to her whenever we meet her partway to where she's walking on foot, or if she asks how Sabrina got up to the roof, or any number of other things that her social circle is or will be hiding if she isn't let in on the secret.
Telling Hitomi about magic has never been just for Sayaka's benefit.
Various things are various. They by definition don't follow from each other.
...And people die when they are killed!
Bringing up magic means they can talk about things they couldn't before. They'd be talking anyway after we bring up magic. That means we can use the opportunity, while they're already talking, to bring up things that they also need to talk about. There is no need whatsoever to wait for later to bring up all the other issues they need to talk about when the chance to do would be practically gift-wrapped for us.
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