Too many collisions with -m 9720

[Mem5]

To find collisions you should use only -m 9710 and -m 9720.

According to https://hashcat.net/forum/thread-3665.html, atom found collisions ("zvDtu!") with -m 9700. That's confusing..

So, -m 9700 is for real password only, and 9710/9720 for collisions.

So my first question was : the mode -m 9720 gives me several -infinite?- collisions, the program don't stops after one collision ; how can I programmatically stop after one found collision ?

Thanks.