The safe answer is to say "it's Jesus' decision" however the question contains such extreme qualifying statements, ("entering into a pact with Satan") it is obvious that one of the several statements in the Bible that make it clear that the man-made "once saved always saved" theory is false, certainly applies to this situation.
Hebrews 6:4-6 (Contemporary English Version)
But what about people who turn away after they have already seen the light and have received the gift from heaven and have shared in the Holy Spirit? What about those who turn away after they have received the good message of God and the powers of the future world? There is no way to bring them back. What they are doing is the same as nailing the Son of God to a cross and insulting him in public!