Sigma was in his office at the casino trying to relax for a few minutes until SOMEONE (Nikolai) used their teleportation ability to teleport sigma on the rollercoaster at the amusement park with him.

Nikolai was excited to have someone else at the amusement park with him because it was quite lonely before when he was all by himself. Sigma on the other hand was absolutely terrified since he went from relaxing in his office to on a rollercoaster.