I chicked a Gazelle

So I was running along 381/2 - not entirely sure I was on the right course and as I pass Shoal Creek Blvd and Seton, this guy crosses over the road and is now running just ahead of me.  As we approached Lamar, I passed him and it was apparent the effort he had put out to stay ahead. He chokes out "are you going to Lake Austin Blvd?".  I'm like, "nope...you must be with the Gazelles".  He replied yes and completely faded.  Never saw him again!