"and who redeemed you from the house of bondage": Even if your only indebtedness to Him were His taking you out of the house of bondage, would that not be sufficient!
"to turn you astray from the way": It is written here "turning astray," and, elsewhere (Ibid. 11) (in respect to one who incites to idol worship), "turning astray." Just as there the punishment is stoning, so, here. R. Shimon says: This one's death is only by strangulation.
("who turned you astray) from the way": even part of the way.