When Elly and Samandriel were gone Dean and Sam turned their attention to Castiel. "Cas, what's wrong?" Sam asked.
"Yeah, you okay?" Dean asked walking towards him.
Castiel ignored them and let go of his head and pulled the sleeve back on his right arm. He then took his angelic blade and begane to carve something into his arm.
"Cas! What are you doing!?" Dean yelled at him shocked.
"The enochian sigle(sp?) for earth." Cas told him in a slightly strained voice. "It will...stop me from leaving earthly plane and being able to return to heaven." He told them.
"Cas, what's going on?" Dean asked.
Castiel paused. "I'm...not sure." He told them before he finished carving and letting his arms fall to his side.