So, here's what ended up happening...
Backstabs and I both sprint towards the archers.
10 + 20 ([14 AGI/5 (rounded down)] * 10)
 I manage to run 30 feet this turn.

10 + 30 ([17 AGI/5] *10)
 Backstabs runs 40 feet closer to the archers, this turn.

I cast fire on the cart!
DEXcheck of 20 or higher to aim.
my roll: 16 (+7) = 23

I set the cart on fire, and the horse runs away.
The archers fall off the cart and take 1d6 damage, each
Human damage roll: 1
Drake damage roll: 2

Human's HP: 13/17
Drake's HP: 13/15

They both try to get up.
Drake's roll: 12 (+12 DEXmod)
Nope! The drake is still on the ground.

Human's roll: 11 (+15)
The human barely manages to get up.

And now the post goes to either Kabling, or Eklispe.