The 39-year-old Windass then went on to produce a string of fine saves to defy the runaway leaders as the teams played out a goalless draw.
Sheridan said: "We've gone without a keeper on the bench for seven or eight games now and I always thought that one day we might get caught out and when Greg got sent off I feared the worst against the league leaders and all in front of the TV cameras.
"But we defended properly as a side and dug in deep. It was a great effort which left us very proud.
"I'm very happy with a point, especially after we had gone down to 10 men and at times even managed to take the game to Leicester. Full credit to the team, they showed great grit and determination."