And on Modern Warfare but let's be real that's never going to happen. They'd do 20% max if anything.
Curse this new time difference!
Knocked out two or more enemies using the same Gas Bolt. - BioShock Infinite
While invisible, used Peeping Tom to knock out 15 enemies with a melee attack. - BioShock Infinite
On three occasions, knocked out an enemy after silently dropping off a Freight Hook. - BioShock Infinite