That is because you have one of the worse connections among hosts. I get it so bad that after I dump a whole clip into someone (Them freaking out in a turrettes spasm the whole time) they run 14 feet away, then stage dive dead onto the ground. Your problem is that you were using the grendel. Even though you see choppiness, they don't even see you for a few seconds. You might think you were at a disadvantage, but you just can't see your advantage.
If you are host, and you have connection or lag related issues, you need to examine your connection from your X-Box all the way to your ISP. My problem is upstream data transfer, and the fact I use my x-box wirelessly instead of with a Cat 5 cable. I still win when I'm the host 100% of the time, because even though it's a bad gaming experience for me, it is terrible for everyone else. 25-2 terrible