Magpie - Redtailed hawk dustup

Sitting on my deck yesterday afternoon, and I was watching this redtail in a tall tree.  Normally we don't see redtailed hawks here, just Coopers and Sharpies, so this one interested me.
Sure enough, a magpie soon flew over to the tree and landed below the hawk.  After a couple of minutes of the magpie changing locations, he flew at the hawk and we have the sequence below.  After this occurred the hawk spread his wings and glided away.
Quite interesting what you can see in the city.