As you rose from the pentagram, Price sighed.

You had been his personal demon a while ago, about 35 years now. He had needed you for a mission, but it had failed, and you were blamed, so Price refused to use you again, sending you back to that pit of eternal torture that you came from.

So why would he need you now?

Price, soap, gaz and ghost had summoned you for a dangerous mission, probably because they just don't want to be killed.