You are being overtaken on the left. The other driver clearly abandons the overtake and slows to return behind you; braking would endanger that return. Must you also slow?

Correct answer

You need not slow if doing so endangers traffic; facilitate return.

You are not obliged to slow in that case, but must facilitate return to the lane under Article 86.2. Do not accelerate or make movements obstructing return. The exception depends on slowing endangering traffic; it does not mean never braking for another hazard. The overtaking driver must abandon the manoeuvre and return safely.