Give him the benefit of the doubt.
Be on your toes and completely alert, but at the very least give the poor soul a chance.
The fact he was so rigidly shunning you and now he has gone the route of desperately soliciting your help even though you are no longer a JW and even carry a sidearm.. shows he is not the hardcore JW who applied their doctrine so harshly now, and it speaks volumes about his position.
He has no one else to turn to.
This would be a prime scenario in which you could give him a
"reverse witness."
What an opportunity to show him true Christian love. I would make mention of it next time you see him. Remind him of how rigidly he avoided you, and how harsh he was in his words. Ask why the "brothers" are not helping him, for surely he went to them first.
Yet, now when he is in a needy position, you are there showing love despite the way he once treated you. At the very least it would make any person with one iota of emotion think.
He may be on his way out of the cult. This is your chance to help someone exit as you once made your exit.
However, like I said at the beginning of the post, it IS the loving thing to do to help him.. just be alert.
JW Viewpoint on Discipline of Children
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"Blows that wound cleanse away evil; strokes make clean the innermost parts." WT 1/15/1954 pgs. 54-62