Vettel was warming his brakes, at the same time Button was warming his tyres.
As a result the closing speed was a lot higher between those two than it would normally be during a SC restart.
All cars go through cycles of brake and tyre warming, to avoid issues when they are back up to full speed.
Stating cars should maintain a minimum speed wouldn't allow them to warm the brakes up.
Perhaps following drivers should be more circumspect and adopt a staggered formation?
As a result the closing speed was a lot higher between those two than it would normally be during a SC restart.
All cars go through cycles of brake and tyre warming, to avoid issues when they are back up to full speed.
Stating cars should maintain a minimum speed wouldn't allow them to warm the brakes up.
Perhaps following drivers should be more circumspect and adopt a staggered formation?