Unless I misunderstand you, you might want to verify this, it might be dangerous to misunderstand how the CSS works .... so .......Two facts:
1) the C2C link to your drone stop instantly,
I think that you will find that if the "Emergency Motor stop" option is set to "emergency only " and the drone is airborne and has NOT suffered what IT, the-drone, considers to be an 'emergency' then the CSC WILL NOT stop the motors at all.
All that will happen is that the drone will descend in a helix whose speeds correspond to the maximum descent rate, reverse speed, sideways speed and yaw rate for the flight mode. It will continue to do so until the CSC position is released. If the flight mode is cine/tripod the drone will probably slow its descent rate once the VPS starts registering the ground.
I am not sure if the horizontal speeds in N and sports mode will prevent the VPS working so the drone might descend into the ground in those flight modes. I have experiment with this with either a Mavic Mini or a Mini 2 in cine/tripod mode and it was a rather nice looking helix. Sports mode was a bit wild and I didn't bring the drone down low. I can't remember if I tried N mode.
If the "emergency motor stop" option is set to "anytime" then I expect you will find that the CSC will stop the motors once the CSC position has been held for a short delay period i.e. it will not produce an immediate motor stop. Depending on the flight mode the drone may reach significant speed during that delay.
At guess the delay period will be somewhere around 1.7 sec. I think DJI increased the delay period of the Air 3 to 2 seconds.