There are holsters with varying levels of retention. The least retention possible with be a friction lock. Next will be a button or strap, followed by a "thumb drive" or Serpa-style lock, and so forth.
Friction- only retention will of course be defeated by just a strong pull. Buttons and straps can be configured so that your drawstroke automatically disengages the strap, but that your weapon can't be drawn without the button being opened or the entire strap brute-force ripped off. Either way should give you time to respond, but your response time won't matter much if you've already been battered senseless because you didn't feel you faced a lethal threat, and chose not to draw.
Canes carried in the non-weapon hand can be used to buy distance for a drawstroke, just as some serious weaponry students train to use the non-weapon hand to cut free from an sidearm grab. A knife may not be inherently more dangerous than a stick, but knife use will always be considered lethal force, even if the user didn't use it in a potentially lethal way.
An attacker trying to gain control of your handgun is a lethal threat. If you the defender can stop an attacker with less-lethal force such as OC spray or a cane before the attacker even knows you're carrying a firearm, that's much preferable.
Friction- only retention will of course be defeated by just a strong pull. Buttons and straps can be configured so that your drawstroke automatically disengages the strap, but that your weapon can't be drawn without the button being opened or the entire strap brute-force ripped off. Either way should give you time to respond, but your response time won't matter much if you've already been battered senseless because you didn't feel you faced a lethal threat, and chose not to draw.
Canes carried in the non-weapon hand can be used to buy distance for a drawstroke, just as some serious weaponry students train to use the non-weapon hand to cut free from an sidearm grab. A knife may not be inherently more dangerous than a stick, but knife use will always be considered lethal force, even if the user didn't use it in a potentially lethal way.
An attacker trying to gain control of your handgun is a lethal threat. If you the defender can stop an attacker with less-lethal force such as OC spray or a cane before the attacker even knows you're carrying a firearm, that's much preferable.