He knew that Shadow has a long memory , and that he would never forget the trick by which Chatterer had escaped , and so the only way Chatterer would ever be able to have a moment 's peace would be to leave the Green Forest for as long as Shadow the Weasel chose to stay there .
Chatterer has a good memory.
It does not say if Chatterer has a good memory or a bad memory only the Shadow has a long memory.
( z1 have :ARG0 ( z2 person :name ( z3 name :op "Chatterer" ) ) :ARG1 ( z4 memory :ARG1-of ( z5 good ) ) )