Will crossbow herbicide kill grass

It's not supposed to, but it certainly killed the grass in my lawn when I tried to use it on the clover-infested areas. I'm not sure why... perhaps I applied it in too strong of a mixture... but I haven't found any other information indicating that it can kill grass even in strong mixtures. I also use crossbow on my pastureland for blackberry control, and it doesn't affect those taller more hearty grasses at all.