Basically it's a bit more complicated than your typical injection attack you would've likely been trained to defend against, you're creating a very very specific firewall that catches and receives a single packet, our target is the incoming trade packet, once blocked our said filter/firewall/program instantaneously copies modifies and injects our new packet so there's no duplicate.
That would be the goal of the app, no? But is it possible at least at the moment to just block the the incoming packet and send the already modified packet instead?