Video of the incident yesterday here.
https://sendvid.com/vt7rrmrj
News reports indicate there were 4 adults on board and all survived. It may be relevant that the site of the incident (Narok) is at around 6,000' MSL.
I know nothing about helicopters, but it sure looks like it was overloaded/underpowered, but undeterred by the obvious basic problem, they tried to get away by building-up a load of airspeed at zero feet.