My only concern about committing him would be this...
"When the unclean spirit goes out of a man, it passes through waterless places seeking rest, and not finding any, it says, 'I will return to my house from which I came.' "And when it comes, it finds it swept and put in order. "Then it goes and takes along seven other spirits more evil than itself, and they go in and live there; and the last state of that man becomes worse than the first."
If you attempt to deliver someone through any other way, but salvation in Christ, they end up worse than when they started.
:think:
However, if you held him underwater the whole time the unclean spirit might get confused :dizzy: