There is something to be said for gaining an ally in a dangerous situation, and Sigma is not about to look too closely at it, beyond ascertaining how said ally fits into the equation of the battle.

Which is why, when he does finally turn to look at Essek, he freezes as if taken entirely by surprise- which he is-

Because his ally is holding a black hole-

For a moment, Sigma is frozen in place, an expression of abject fear on his face as the melody screams in his ears-

It cannot be- it cannot be-

But there is no pull. The light does not bend. Essek is unharmed.

It is- magic, of some sort. It must be.

He gathers himself as quickly as he can manage. There is a mission at hand, and he cannot afford to falter. "Holding the line. Can you assist?"