Yeah dude lol yo plants bout to get ruined.Dude, is that a grasshopper? If so, I'd say get him outta there. I may be wrong, but I'm pretty sure grasshoppers eat leaves.
If they can eat a scorpion, imagine what they could do to a plant!!!! LOL j/k. I don't know if a praying mantis would hurt a plant or not. As far as I know, they are meat eaters all the way, like you just said. Just don't let 'er spit in your eye! GLLOL Grasshopper ,don't think so .FYI that my friend is a Praying Mantis , they don't eat plant matter ,there diet consists of bugs and only bugs they shred there pray piece by piece starting with there prays head. they are the T rex of there world , when large enough they have been known to eat scorpions .