City played an entire second half with 10 players for the third time this season and suffered the consequences with a 4-0 defeat at Khalsa.
With recent goal scoring signings out through injury (Jack Jeys) and suspension (Sean Brain) City's goal scoring options were limited and rarely troubled Khalsa keeper sam Arnold.
City's bad day started after just 16 minutes when Dan Okojie went off injured to be replaced by Colin Smith. City's strike force were continually chasing long balls over the top and rarely got into decent positions or on the end of the balls.
On 38 minutes the game turned on its head when Craig Jones was given a straight red card for bringing down Whittaker in the box. Dan Joseph saved the resulting penalty but Armstrong was the first to react and finished the rebound.
The woes continued in the second half as City conceded another penalty which was despatched by McKenzie first time. City tried to come out on the break but Khalsa looked dangerous at every opportunity and added a third with a powerful header from McKenzie.
Khalsa then added a fourth on 82 minutes with a fantastic headed corner from George Taylor.
One to forget for City, who must address the problem of players being sent off in the first half.