Until the other team all pulls out hephs?
It's lolworthy how toothless a flame harraser is against a heph B, too fast to hit accurately and it's futile trying to overheating a hovercraft lol...
That does present a problem, but its never significant. Reasons?
You go faster so you can just run away and take on easier targets until your bloated with C-Bills.
You have at least one non flame harasser in the group, or possibly even your own heph, so he can put out non flame damage whilst you ram the heph / get into its face so it cant drive properly while making it almost unable to see.
If there is only one heph, you just enjoy gang raping it 4 on one because on pub games hardly anyone runs together. Thats even if they get one out as a counter.
Even without that, with the amount of damage flamers can do, youd be surprised how the fastharasser can easily chase down and kill hephs under ideal conditions. Did it several times on snowblind last night.