Hey dude,
Thanks for the love.
You can create this with standard emitter, I’d advise to go down that route to avoid the xpresso headaches.
For your problem make sure you have the rotators falloff set to spherical, then Make sure it’s oreinted correctly, you may have to experiment by rotating it 90 degrees on different axis to get the particles to rotate in the right way. To me it sounds like falloff should do the trick. If you set up 2 rotator fields with spherical falloff and place those in front of the oncoming particle, once it hits the falloff field they should rotate and split.
Should if that doesn’t make sense or feel free to send over a scene file if it isn’t NDA’d.
Cheers!