But if he thrust him suddenly, without enmity
 Push him from a precipice, before he is aware, without any malicious design against his life, but merely through accident: 
 or have cast upon him anything;
 from the top of a house, or from a building he is pulling down, or pushes a bowing wall upon him, not knowing that he is passing by it: 
 and without lying of wait:
 or having contrived to do it, just as he goes along, or in any other similar way.