I'm not 100% sure how Cthulhu's attack works. An investigator has 6 maximum stamina, and 4 maximum sanity (5 and 3 after applying cthulhu's powers). When the final battle begins, the investigator has 3 stamina remaining, and 1 sanity.
When Cthulhu attacks the investigator's max stamina or sanity is reduced by 1. When this occurs, does his current sanity/stamina also decrease? If it does not, the investigator will have 7 turns before one of his stats will become zero. If it does decrease with the max, he will only have 3. How does it work correctly?