Locust Hornet Battle? What kind of Hornet?

So im outside of my house and i hear this crazy sound. I look ver and see something fall from a tree. I walk over and a locust and what im guessing was a hornet (yellow and maybe partly red) Were going at it in the gr. The hornet came out victorious bit off the locusts wing and then just flew away. I picked up the locust it was partially alive and i put it back down. I came back a few hours later and there was a huge gaping whole in the locust. What happened? Did the hornet lay something in it?