the grab incoming missiles mid air thing is intentional, but messing with opponents catapalt is a bug. thankyou for commenting.
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about messing around with the enemy catapult, I wasn't able to always do it but I did do it some times. I remember doing it immediately in the first level/arena.
I remember that the enemy already had placed a ball in their catapult, I'm not sure if they were clicking and dragging and I hijacked the control or if they were not clicking at all and I clicked first so I was able to control it.
Hope this helps you crush that bug :)