@Sweenytom
It is sniping. Whether the intention is, intruding in halfway, and taking over the next chapter is considered a snipe. When you see two groups are consistently uploading the same chapter, it most likely means that they are trying to fight to the "right" to scanlate, in other words, monopolize the series. I bet there are few scanlators that don't care, but those are extremely in minority.
Putting sniping aside, this one was badly translated and he really needs a proper PR to proofread his translation as well. This extra chapter was relatively easy to translate, but when it comes to the main storyline, it could get a lot more hectic.