In the wiki it says the following:
The player will instantly be slain if they try to summon a second Eye of Cthulhu while one is already attacking him/her
but look at the screenshot below:
So my follow GB Terraines, Go fight your epic tales of epicness!
(also I somehow summoned two of the with one eye ball. so don't ask me how. I think it is a bug)
Im also not the dude with the purple phaseblade, im to the left a little it makes me look like I have a green arm. Its really gold.