Langtoft made it eight games unbeaten with a resounding victory on Saturday last week.
After scoring five goals the previous week, Langtoft went one better and put six past Riverside.
The Vikings opened the scoring in somewhat fortuitous circumstances when teenager Josh Hales delivered a free-kick into the Riverside box, the home keeper misjudging the bounce with the ball looping over him and into the net.
Langtoft added a second soon after, midfielder Dan Jarman poking the ball home from inside the box after the Riverside keeper had kept out an initial effort from Dan Morris.
The Vikings could have extended their lead further with Hales, Talal Karama and Jobi Froud all going close but it was Riverside, against the run of play, who had the ball in the net. Langtoft failed to clear their lines and the lively home forward placed the ball past Robbie Virgin and into the far corner.
On 40 minutes, a Riverside midfielder was given his marching orders for kicking out, which effectively killed off any momentum the home team had built up.
Langtoft returned from the half-time break and immediately increased their lead with Hales playing Karama through, who expertly finished his one-on -one.
Langtoft’s pass and move game was beginning to pay dividends, Dan Morris being the next player to latch onto a through ball and coolly slot home.
Karama added his second of the afternoon to make it 5-1 before Froud lofted a delightfully-weighted pass through to Hales who lobbed the onrushing keeper first time.
Riverside did manage to add a second before Jacob Smitheringale could have restored the Vikings’ five-goal cushion, but he could only fire his effort straight at the keeper.
Langtoft’s Phil Gadsby said: “This was a potential banana skin for us today, Riverside have scored a lot of goals this season and are renowned for getting the ball down and playing, so to get such a comprehensive victory was fantastic.
“The sending off probably killed the game for them as they were just starting to find some rhythm but I’ll take nothing away from the lads today, some of the goals we scored were a different level and the work rate of the boys was superb.