This article contains lore created collaboratively by the Blaseball community. It is just one of many Stephens that we've found in the Interdimensional Rumor Mill. You can find more Stephens about Stephens Lightner at their Stephen Registry.
Stephen Flash was the team captain of the IF-573.44 sloccer team Denver Brights, known for being composed entirely of Goldenrod Gall moths. Despite their composition, they were rather agile and blocked many goals using their 'headbutt', which was actually the combined moths that formed the head and neck throwing their entire weight towards the ball at the same time.
Flash is said to be the reason why Lightner is sometimes distracted by bright lights.