[morethanpretty]

According to everything I found, yes my facts are right.

Looks like she was resisting arrest to me. Taze the bitch. His life isn't worth less than hers. Just because she's old, doesn't make her a non-threat.
This is TEXAS, where everyone has a gun rack in their car, a gun on their side and another in their boot...if they're goin light that day.

Oh and the shoving or assaulting he does that you're referencing: he is clearly telling her to step back behind the truck. After repeated telling and pointing, he finally pushes her there, she doesn't fall and doesn't stumble, he must not have done it very forcefully, just enough to make her move.
Know how many cops get hit by cars on these routine stops? I don't, but enough that Texas has made it a law that you either have to change lanes or slow by 20mph when passing a cop on the side of the road. (Not very enforceable law though.) Again, he shouldn't have to lose his life over this old lady, he had every right to move himself and her out of danger.