check the 1:22 seconds where Sebastian covers off the added safety features that were added for FIM rules before FIM change the rules saying no electric bikes.
I know this UK arena cross event was not an issue but I wonder if the UK team had to fit the lanyard that FIM insisted be fitted.
Separately the Stark magnesium Alloy battery case is pretty well protected and the risk of. a thermal runaway fire is also quite small.
The standard Stark battery we believe has 400 of the 18650 style cells.
It was rumored that the battery for this Arena cross was modified to have less than half the number of cells and weight just over half that of the std battery.
even if there was a fire the size would be about that of 12 Milwaukee drill batteries .