<Delmas didn't succeed here as Vick's leg was not planted at the time of the cheap low hit with the helmet, which you can see from the image freeze. Look how close it was! That would have at least torn the ACL on Vick, potentially the ACL, MCL, and Patellar. It surely would have ended his season and perhaps career, because it is those wheels that put Vick on the map, not his arm.
I can't find it on youtube, but I remember a hit Delmas put on Finley like he did Ovie, where J-Mike just caught it and turned around, and almost got his ACL tore. He tried.
Again, I'd like to see defenders like Delmas forced to wear the old 1930's style leather helmets... see if he still leads with his head high & low.