" Come on, come on, listen to the moneytalk...." which means that this will be called off but not until they have enough heats for the result to count.
I think it was the last year at Ullevi in Gothenburg where it rained as well and they (FIM/BSI) didn't call it off until after 12 heats coz' the result was then
valid and thus they didn't have to repay ticket money.
As for heat 4, IIRC heats cannot be awarded in the SGP.