Day2Dream said:
Something just occurred to me. The basic process of alchemy is [knowledge > destruction > reconstruction]. In the scene where we saw him use his recreation arm he never used his right to first destroy.
Does his left arm destroy and recreates straight away? What's the point of his right arm then? Did Arakawa finally screw up?
I interpreted it in this way: Scar's right arm destroys, no problem there. But I'm guessing maybe his left arm can "recreate" without having to first destroy (in fact, *without being able to destroy*), essentially meaning either A) it works more like manipulation rather than destruction THEN recreation, or B) it can create something from nothing, like a philosopher's stone.
The way I see it even if I'm wrong with what I said above, is that each arm can perform its own function WITHOUT the need to be a part of the alchemy process as a whole. Destruction just means destroying, and recreation just means recreating, but without having to first destroy, bypassing the need for materials, or just using whatever is around but "transforming it" without "breaking it down" before doing so.
The argument can be made such that the author didn't screw up at all. Easily. We'll see how she explains it herself eventually though.