Firebug
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Not how it works. Hermean Potential.
3 rerolls total. Note it says "On the next roll ... rolls twice and takes highest". Then every 5 CL you get an additional reroll on the next check after.
And it's the next 3 rolls, you don't get to save it for the important roll. So they could all be blown in half a full attack. Or checking for ambushing panthers...