I had the exact same thing happen to me except I was the one following.
The other guy was attacking a base in a 110 and I was in a Ki-84 I think.
He went vertical and I followed him up, as he made his turn and came back down I plastered his left engine. After a chase across the base and a few more pop shots at him from 1k out he ran into the mountain trying to go over it.
so I get a PM..
from oDallaso: You got no game noob
Now keep in mind this was after he had already HO'ed me while I was chasing one of his buddies.
These guys that get pissed off and have to send PM's crak me up.