Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to perform the guillotine choke [title] Get your opponent's head down. [step] Wait till your opponent makes a move toward your legs to grab their head. Or if they have their head slightly bent toward you, reach out and pull their head down by clasping your hands behind their neck and pulling down.

Ending1: If they fail to respond to your grab, try again. [title] Register your body's physical reaction. Ending2: Get their head at the level of your chest, with their face toward the ground. [substeps] Wait for any time your opponent comes toward you with their head toward the outside of your body. Ending3: You will need your hands fairly close to their ears so their head is tilted forward. Place your dominant hand on their head with the back of your elbow directly underneath the top of their head. Ending4: This will allow you to have the illusion of choking your opponent. [title] Roll them over to face the floor.

Answer format: ending1/ending2/ending3/ending4