R. Eliezer says: "And the blood of your sacrifices shall be spilled": (There is) blood, even if there is no flesh. How, then, am I to understand "And you shall offer your burnt-offerings, the flesh and the blood"? Flesh is being compared to blood. Just as the blood, by sprinkling, so, the flesh by "sprinkling" (i.e., flinging).
I might think that the Cohein stood from afar and flung them (the flesh sections onto the altar); it is, therefore, written (Vayikra 1:12) "and the Cohein shall arrange them": He stands close (to the altar) and flings them in order upon the wood pile.