I have not seen the mating dance of mantispids, That is something that I will absolutely look into.
Only about 20% of praying mantis males get eaten by their "wives" That is a better record than humanity. It has to do with mantis species and their natural environment. Mantises from humid climates hardly ever need to move. These are less aggressive than species from arid climates, where food must be hunted.
The mantispid attaches is self to spiders and eats the eggs as they are laid.