Rasal:
"Right, on it," Rasal replies. He focuses on the ground a short distance ahead, in the direction from which the riders are coming, and tries to summon up the image of fire and thick smoke to block their path.
Rasal rolled 7 using 2d6 with rolls of 4,3. Invoke.
Rasal rolled 3 using 1d6 with rolls of 3. oops, wasn't rolling enough dice... (but I guess that didn't help anyway)
The fire and smoke scares the heck out of the horses of the coming riders, but the riders themselves are not fooled-- there's no sound of flames.
The coming riders urge their horses forward with great urgency, and eventually get through or past/around the image of the flames...
So on one hand, Rasal and Victor get much more of a head start than they would have otherwise.
On the other hand,
1. since their pursuers came via the road, they're going over countryside now, and there are occasionally fences or little streams to jump. (On the third hand, at least their pursuers have to deal with these things as well.)
2. They don't have such a head start as to be out of sight of their pursuers, though they would be very soon if they could go faster... but their horses are already going as fast as is safely possible.
3. Their pursuers are surely locals who know this part of the world better than do Rasal and Victor.
So, what now?
--Try to evade pursuit via another magical distraction?
--Try to evade pursuit via just riding and fast?
--Try to evade pursuit by taking advantage of some sort of topological quirk of the terrain up ahead?
--And whatever you do... You're currently headed sort of south-by-southeast, but where are you going?
----South, to the desert, and eventually The Sandstone?
----Southeast, toward the city (eventually?)
----East, toward the vineyards?