Weird grass, what do I do?

Question:I have weird weeds or weird grass (not sure) and it grows only in one patch and it is pretty thick long blades that lay down in like little circles. Before it was carpet grass but most was dead so I threw out bermuda seed and now it is recovered so I don't know. How can I kill it without killing the rest?

Answers:
just fertilize it with 13-13-13 lawn food and let the bermuda grass choke out the weeds.