So heading home, enjoying the fine weather, after a little spin when roadie comes screaming past me, down in the tuck position on his tri bars.
OK fair do’s.
But then having gained 100m on me he does a u-turn and heads back the way he has just come..

Forgot his condoms?

intervals?

Timing an out and back distance to include a turn about would be my guess.

TT over set distance?
Wanted to confirm that you are as ugly from the front as from behind?

He was probably in the middle of an evening 10 mile Time Trial – they do 5 miles out, 5 back. Or maybe it's the course of a 10m TT and he was just practising.

They're time triallists, a far weirder sub-group even than roadies! 😉

He was probably reeling you in for the last mile and couldn't resist following you, once he got ya he turned round to rejoin his normal route 🙂

3.30 in the afternoon a bit early for a evening TT, and way off
any of the local TT courses.

He forgot to wave first time past?

Edit; you know how touchy mountainbikers can be about this.

like spooky said, he is so dedicated to his cause that he'll go out of his way to show you who's the daddy!

He was hunting you for the points kill. 100m minimum for the pass to count

http://www.itsnotarace.org/