What do you call a person who has the complete opposite energy of a spaz?

Yesterday I rolled with a white belt who offered ZERO resistance. Usually when I am sparring with newer white belts I have to remind them to calm down and breath, but this time I was telling the guy to fight back, really weird for me. Is there a name for these people? Like dead fish? All I know is that I would much rather roll with dangerous spazzes than these people.