Secure Boot is the bouncer at the door. It checks the cryptographic signature of everything that tries to load. If the signature doesn't match Microsoft’s or your motherboard manufacturer’s key? Denied.
You’re kicked back to the desktop. No smoke. No error code. Just a silent crash. Or worse, a pop-up that reads: valorant enable secure boot
If you are playing on a 6-year-old laptop, you might be cooked. Many older motherboards don’t have TPM 2.0, or their Secure Boot implementation is broken. For you, Valorant is now a brick. Secure Boot is the bouncer at the door