I'm not sure that going into attack mode and acting out of anger is a good idea. I am not entirely up to speed on the sitch, but since when is acting out of anger the appropriate response?
I sympathize with John's sitch, and certainly he should protect himself and his child. However, this should be done in a dispassionate way for his benefit, and the benefit of his child and his future relationship (whatever that may be) with the mother of his child.
Get an attorney, protect yourself, but do it in the right way for the right reasons.
