Glynn was one of four Saints dual registered with Moseley this weekend, and while the scrum-half was originally named on the bench he stepped up into the starting line-up to make an immediate impact with his early score.
Prop Ethan Waller also started the game, while Danny Herriott and Sam Dickinson both saw action off the bench as Moseley took themselves five points clear of Jersey and seven of Doncaster in the race to avoid the drop.
However it was a different story for the five Senior Saints Academy youngsters who were available to National League One clubs this weekend.
Danny Hobbs-Awoyemi came off the bench in Coventry's last-gasp 23-14 home reverse to Fylde. Despite going down to 14 men following a first half red card, Coventry came back from a 3-14 deficit to lead 23-14 with 10 minutes to play.
However Fylde struck back with a converted try before landing the knockout blow with a drop goal two minutes into injury time.
Although Alex Woolford and Matt Williams were unused replacements at the Butts Park Arena, both Darrell Dyer and Will Hooley saw action in Cambridge's 26-58 home loss to Blackheath.
Dyer played all 80 minutes, with Hooley coming off the bench at half-time, but the young Cambridge side could not match Blackheath's experience.
Herriott, Hobbs-Awoyemi and Hooley all now join up with England Under-20 ahead of their next Six Nations clash with Italy, being played at Franklin's Gardens this Friday night.
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