After Nikolai saved Sigma and prevented Fyodor from killing Sigma, Nikolai told Sigma that he should find out Fyodor’s ability, since Nikolai needed this information in order to independently kill Fyodor.

When some time passed, but Fyodor escaped from prison before Nikolai ended up there, Fyodor somehow found out about the agreement between Sigma and Nikolai.

When Fyodor found himself in Sigma's heavenly casino, which is literally in the sky, Fyodor found Sigma and did not pay attention to the fact that he was surprised that Fyodor was not in prison.

Fyodor walked up to Sigma, grabbed him by the wrist and pressed his wrist to the wall.

"Poor Sigma. Nikolai is the one who told you to understand my ability?"

Fyodor was below Sigma, as it leaned slightly towards it. Fyodor smiled devilishly with apprehension, arrogance, and mockery.

"... Ok, no problem, I'll tell you, but..."

Fyodor looked up at Sigma's face, grinning.

"Whose side are you on?"