Sebastian was just slithering down the halls to try and find stuff to sell to whatever Expandable finds him, hes found a few things but not enough to make him satisfied...

as he looks through the drawers he suddenly hears the familer screeching of Pinkie coming towards him... With no other place to hide and not die he goes inside the closet locker

but when he opens it theres a void-mass in tthere that grabs him and pulls him inside in a swift motion... If he isnt saved he could get eaten by the void-mass...