I hope someone can help. I am stuck at the level with the 3 Hydras(2 small ones and the 1 big one at the center). I managed to brake the center mast into a smaller stake. Now I do combo attacks until 1/3 of the Hydra's power is left. Then the Orange Circle appears. I press the Orage circle and I get one blow in before the Hydra comes back to life again. I have tried this over and over about 20 times now and the Hydra keeps recovering. Is it a timing issue with the Orange circle? Thanks in advance to anyone that can help.

You have to get the hydra head on top of the stake after you get rid of the two small ones by climbing the boxes & dropping a stake on them.

Thanks, I tried it on easy mode and was able to get past the level.