The great snake glides across the floor and--perhaps drawn to the light--strikes at the strange creature without hesitation. Has she dealt with its kind before?
Bite attack on Not A Rat: 1d20 + 4 ⇒ (20) + 4 = 24 "Good snake!"
Bite damage on Not A Rat, if applicable: 1d3 + 3 ⇒ (3) + 3 = 6
A crit? on Not A Rat, if applicable: 1d20 + 4 ⇒ (9) + 4 = 13 Not great, but hey, it's probably flat-footed!
Crit damage on Not A Rat, if applicable: 1d3 + 3 ⇒ (2) + 3 = 5
Her body flows around the creature, preparing to crush the life from it.
Grab (free action grapple attempt, if bite succeeded) on Not A Rat: 1d20 + 4 ⇒ (8) + 4 = 12 Again, maybe? If it's flat-footed?