Why does sending a challenge freeze the screen?

At the moment when I start constructing a challenge to send someone it freezes the rest of the screen. In particular it freezes the msgbox which makes it impossible to keep talking to them while I’m setting up the challenge. Is this a deliberate design choice, for some reason, or a design oversight? It would be nice to be able to talk to my opponent while setting up the challenge.


That certainly does seem intuitive…