Slow down. That is not a 1:2 halyard described by T-shan because it is a back-to-back block.

I always wanted to see 1:2 halyard system because the coinciding retrieval line would also need to be 1:2 or some other way to carry the extra line. Most likely the retrieval 1:2 block would have to partially enter the chute sock and the retrieval would most certainly run through a block on the rear beam.