Leeches that they may be, what kind of threat does a leech that is running away pose to you? The answer: NONE
And that's what matters in court if by some chance you did hit them or god forbid someone else.
It may not pose any threat for him running away but if he robbed them im sure it wasnt the first time he had done it an damn sure it wouldnt be the last time so i say to bad he didnt hit him so he couldnt do it to anyone else