Can somebody explain psychologically why people do not report female abuser ?

Hi guys, Im doing social experiment on gender stereotypes. However Im having difficulties on relating it to gender schema theory. Anyhow, can somebody explain in simplest form with related psychology theory on 1. why pedestrians will not help male being abused by female on the street? ( if the female hit and trash talk male) 2. Why pedestrians are more inclined to help female being physically and verbally abused by male. Thanks,