I think that I understand the overall meaning of the sentence:
He forcibly stole her bag and ran away. But I'm not sure about that part (一把把), neither its meaning nor its grammatical function (I'm not even sure if it is a single element or I've splited two and joined it :/ ).
I've searched the web, but it seems to be a not-so-frecuent construction. I've found it on a book (汤小团－东周列国卷－１, p.76). When I google it, I get only results for the classifier (一把).
Many thanks in advance!