(I haven't finished typing everything up yet, please wait 20 minutes before reading. Very sorry.)
Stanisław II was truly making a final desperate bet.
In the worst-case scenario, he and officers like Bilak would become prisoners of the Russians, and the tens of thousands of flintlock guns, thousands of tents, and uniforms meant for "surrendering arms" would also fall into enemy hands.
But he decided to take the risk.
Bilak's previously demonstrated level of command was not outstanding, and the Military Committee had already considered replacing him.
Should he really be detained by Korezenikov, an officer would immediately take over the defense work in Minsk.
The Poles would then propagate in the army that "Bilak was shamelessly detained while negotiating with the Russians," in order to inspire the soldiers' fighting spirit.
After the King spoke to him about this matter, Bilak immediately accepted this perilous task without hesitation.