Sketch of the standard flare model. A plausible scenario in the chromosphere explaining our observations is depicted. The observed chromospheric condensation and evaporation near the flare footpoints are indicated by red and blue arrows, respectively. The dashed black line and the solid black line refer to the average RFs (around the line core) of the chromospheric lines (Ca II K and Ca II 8542 Å) to the temperature during the no-flare and flare peak times, respectively.