If timed correctly, Wheeler won't take any damage. It can be done by dodging right after when the enemy is about to attack and when the animation for attack just starts. Doesn't always work, it required me a couple tries. After this triggers, Wheeler will behave like in godmode.
1. Get a weapon and an enemy. 2. When enemy is about to attack you, press attack and dodge right after starting the attack animation and before dealing damage to the enemy. You have to dodge in such a way that the enemy will hit you during dodge. 3. If timed correctly, you won't take the next hit.