If a trick works once, it might work again.

Unfortunately too many GMs have heard the advice that:

If a player tries a trick like throwing sand in an enemy's face, you give them a combat bonus. But then pretty soon they'll be trying to throw sand at every enemy they encounter. If this trick worked every time, then people would go around carrying bags of sand instead of swords - so don't let it work every time!

So leave it just long enough that they might have forgotten about the last time you used it.

Transcript

[SFX]: zoooomm!!
[SFX]: zoooomm!!
Leia: I need to gain on this guy.
Leia: To get over the trees I hit the altitude boost...
[SFX]: VYOOOOOOOooooooo...
Leia: ... clear the intakes...
Leia: ... and open the throttle...
[SFX]: vaHOOOOOM!!
Leia: Now this is pod racing!