As the giant door slowly opened, a powerful, imposing pressure came out of the room inside. Johnson faced it first. Since the force was so powerful, it couldn't help but take two steps back. As it was Abel's summon creature, naturally speaking, Abel would feel the same imposing pressure that it experienced. He wasn't all that weak against it, though. Whether it was his spiritual or physical strength, he still had a very strong resistance against the imposing pressure.
After the Titan Temple's imposing pressure swept across him, he managed to stay on both of his feet. He was even able to help Johnson carry some of the weight. This way, it wouldn't have to take too many steps back as it tried to make the door open completely.