I agree that the phrase "To be keeping yourselves free.....from blood" -- apecesqai.....kai aimatoV is somewhat of a cryptic statement.
Personally, I think if it had been a command against murder (Shedding blood) it would have been worded with the force of a command. Yet the entire passage lacks that flavor and comes across only as friendly counsel.
What all JW's and many XJW's seem to have trouble grasping is the simple fact that the phrase "Keep abstaining....from blood" is not a grammatically complete statement and can't be treated as if it were.
We "Abstain" only from finite acts. There is no such thing as abstinence from a physical object, like blood. When the word, "Abstain" is used in connection with a physical object, like blood, there is a finite act implicit in the context.
To illustrate this basic fact, consider how the meaning of an "Abstain from" phrase is entirely dependent upon the context in which it is spoken.
1. A man with a skin condition is told by his dermatologist that, "Persons with sensitive skin should abstain from alcohol."
2. A pregnant women is told by her obstetrician that, "Pregnant women should abstain from alcohol."
Notice the fluid nature of the "Abstain from" phrasae. The man and woman are obviously being told two entirely different things. The man should not apply alcohol to his skin and the woman should not drink beverages containing alcohol while she is pregnant. Our source for the verbs, "Drink" and "Apply" is the context of the statement.
The man is still free to drink alcoholic beverages and the woman is still free to apply cosmetics containing alcohol to her skin. Yet they were both told to, "Abstain from alcohol."
Similarly, with the Apostolic Decree, the act in question is "Eating" and only eating. Most paraphrased and even some DE translations make this clear.
"Eat no food that has been offered to idols; eat no blood; eat no animal that has been strangled; and keep yourselves from immorality" --Moffat
"Avoid what has been sacrificed to idols, tasting blood, eating the meat of what has been strangled and sexual immorality" --TEV
"You must abstain from eating food offered to idols, from consuming blood or eating the meat of strangled animals, and from sexual immorality." --Phillip's
"That you abstain from what has been sacrificed to idols and from [tasting] blood and from [eating the meat of animals] that have been strangled and from sexual impurity." --CEV