Finley Thorndike was sent off in the first half as Larne breezed past 10-man Crusaders 4-0 at Inver Park.
Dan Bent opened the scoring in the 11th minute before Thorndike, on as a first-half substitute, was shown a straight red card seven minutes before the break for an incident off the ball with Mark Randall.
Sean Graham and Matty Lusty scored quickfire goals after the restart and Tiarnan O'Connor added a late fourth.
Larne move up to second in the table and are one point behind leaders Glentoran, while Crusaders are three points above the relegation zone in eighth.
It was alleged by Larne manager Gary Haveron that Thorndike's red card was for a spit in the direction of midfielder Randall.
"Unfortunately when Mark and him had a clash it looks like the lad [Thorndike] has turned around and spat in the player's [Randall's] direction," Larne manager Gary Haveron told BBC Sport NI.
"It's something you can't do. There shouldn't really be a place for it.
"It was a mistake from the lad. The referee was on hand and seen it, and it's up to him what he puts in his report."
The Northern Ireland Football League and Crusaders have been contacted about the incident and manager Declan Caddell said that while he did not want to comment, "a matter like that will be dealt with in house".
"The referee has brandished the card and I'm not going to comment on it before I get any more information," Caddell said.
The Irish FA told BBC Sport on Wednesday that the referee's report had been received and "any issues arising will be dealt with in due course by the Irish FA's Disciplinary Committee".