For the first two segments, wait for the his attack, watch out for the blue counter marker, counter back using Y, then counter again. Also for the second part, after countering, use the batclaw by doing LT + X to drag him closer, then press towards + X for a clothesline, then follow up with 2 strikes. When he lobs a flashbang, tap Y fast, then tap X fast as well. When he shoots the Grappler, wait until the counter mark shows up, then tap Y quickly to throw it back at him. During the sword part, use the same strategy on the second part and don't try anything else. Stick to the gameplan and win. Follow the video below.