Now that the edge of the ring was being covered with a multiple strings that act as a fence which was blocking Helios from entering the ring.
But unknown to Helios that the he was in was the only thing that had a fence made of strings and because of the confusion ability had already taken its effects Helios could see that the edge of the ring was covered with string fence.
And since he had a one minute to returned to the ring Helios instantly wear his cosmic energy armor and grab at the string fence while he stepped into the very edge of the ring but because the place where Helios landed didn't have any string fence and since he was affected by Elaya's confusion ability that causes him to see that the whole area around the edge of the ring was covered with string fence.
So when he tried to grab and hold an area of the string fence which actually didn't exists it causes Helios to be out balance and fall at the edge of the ring.