Why does atticus ask ewell to write his name while on the stand

Atticus has Bob Ewell write his name to prove he is left handed and the one who hit Mayella. Atticus's defense is based on the premise that Tom Robinson could not physically have attacked Mayella, and that there is no evidence that she was raped. ... Bob Ewell doesn't understand why he is being asked to write his name

ok do the correct answer is idk vgfhsbv #fu

she could put on music that makes her sleep