Must have copy cat on one default class that is not the flag class.
1. Have a friend holding the flag shoot you.
2. Use copy cat to copy their class.
*Make sure your friend does not look at you as it will kick you out*
3. Have your friend finish the round so the game goes to half-time.
4. Once the next round starts, you are invincible.

This does the God-Mode/Invincibility glitch.

To get both flags:
Make sure you do the above God-Mode glitch first.
1. Grab the first flag.
2. Go spectator mode.
3. Switch teams and spawn in.
4. Pick up the second flag