[If] those [bloods] which are applied below mixed with those [bloods] which are applied above — R’ Eliezer says: Let him apply [the blood] above and view the lower [blood] which is above as if it were water; and [let him then] return and apply it below. But the Sages say: Let them be poured into the canal. But if he did not take counsel and applied [the blood above], it is valid.