What step should be taken following a snakebite before medical help arrives?

Keeping the victim still and calm is crucial following a snakebite. This is because movement increases the heart rate, which can lead to the quicker spread of venom through the bloodstream. By remaining calm and still, the victim can help to minimize the physiological effects of the venom while waiting for medical assistance. Additionally, restricting movement prevents injury to the affected limb and reduces the chance of secondary complications.

The other options do not align with best practices for managing a snakebite. Encouraging movement can exacerbate the situation, while applying ice can cause frostbite and aggravate tissue damage. Offering food or drink is also discouraged, as it could complicate medical treatment and might cause choking if the victim needs surgical intervention. Thus, the focus should always be on keeping the victim still and calm until professional help is present.