Yes, I know that you can't knock them away from you, my point was that you will be 1 tile further away from the center of explosion, thus dealing less damage to you than if you would stand in the middle of explosion.
If theres a mine blocking a path you want to go, consider of kicking it, not stepping on it. Since you are further away from middle of the explosion, you will take less damage.
Great Healths spawn tougher monsters, so they are dangerous untill you'r stats and gear are moderately high. After you have access to octiron armors and addy/valpurium weapons you it comes valuable. Notice that it has lower armor value though.