The match keeps running while this is open - other players can still see and hit you.
Aim assist only slows the right stick a little while the crosshair is on a visible enemy's body, and follows its movement while you turn - never through cover, never toward the head, never for the mouse.
Using your Bluetooth headset microphone may reduce game sound quality on some devices. For better audio, try using your laptop's built-in microphone while keeping your Bluetooth headphones as the sound output.