When fighting the Ender Dragon he goes through the obsidian towers.

When fighting the Ender Dragon he goes through the obsidian towers.

What I expected to happen was...:
He goes around them or destroys them

What actually happened was...:
He Goes Through Them

Steps to Reproduce:
1.Go in the End.
2.Start fighting him.
3.Wait till he fly's through the obsidian towers.