EW:
As I said, I don't agree with him, but nonetheless, I wouldn't even say that it become invalid. You're only taking a portion of his theology, though granted it's not been thought all the way through, from a technical level.
The reason that I say this is because the blood is efficacious, even in his explanation, it's just that he places far more onus on man to perform and work in sympathy with that..
DDog:
Yes, that would be the correct theological use for the phrase "trampling the blood". Unfortunately we probably all do that, to a degree, too.
In the context of the thread, though, we're probably as well accepting the error, and applying it to pre-conversion actions. That is unless you'd like to offer a more suitable expression? (which probably wouldn't be a bad idea).