Final answer:
In this specific situation, the EMS provider should presume that parental consent is implied and proceed with treatment.
Step-by-step explanation:
In the given scenario, where a minor accident victim has blood spurting from the brachial artery and the parents are not present, the EMS provider should presume that parental consent is implied and proceed with treatment. However, it is crucial for the EMS provider to document the actions taken and inform the parents as soon as possible.