Los Angeles Galaxy's winless run in MLS came to an end on Friday, while Jason Johnson scored on the final play to clinch a 2-2 draw for Chicago Fire.
The Galaxy had not won in five games and looked set for a sixth match without victory against Houston Dynamo until second-half stoppage time.
Alan Gordon's header looped into the net from the cross of fellow substitute Robbie Keane in the 92nd minute, as the reigning MLS champions triumphed 1-0.
The drama did not end there, however, with Galaxy full-back Oscar Sorto sent off in the 96th minute for a tackle from behind on Dynamo's David Horst.
Houston were denied a penalty too, with the referee awarding a free-kick on the edge of the box, despite Sorto's tackle beginning inside the area.
A sharp turn from Justin Meram was critical in the lead-up to Columbus' first goal, as the Iraq international picked out Ethan Finlay, who squared the ball for Kamara to finish.
Kamara completed his brace with a header nine minutes after half-time, following Kevan George's flick-on from Federico Higuain's corner.
But Chicago hit back in the 58th minute through David Accam and, after dominating the closing stages, the Fire claimed a point thanks to Johnson's long-range header from Eric Gehrig's cross.
