"I wanted to thank you again for your help on Sunday. I can't tell you how much I appreciate it. You're always willing to help friends in need and it's one of your very best qualities. It's very selfless and helpful.
Thanks again. :)"
His response: "Thank you. Anytime."
Perfect.
IMO, it would be pursuing IF you attached expectations to it OR asked for something more. I don't believe expressing gratitude or giving an authentic compliment at times like these, would ever be "pursuit", actually.
(At least off the top of my head, I can't think of how authentically kind words or gratitude would = pursuit, but I'll think about it.)
M: 57 H: 60 M: 35 yrs S30,D28,D19 H off to Alaska 2006 Recon 7/07- 8/08 *2016* X = "ALASKA 2.0" GROUND HOG DAY I File D 10/16 OW DIV 2/26/2018 X marries OW 5/2016
Anytime." 
