A' and 'B' were sworn enemies in school. 'A' had pushed 'B' due to which he fell down and his two front teeth were knocked out. 'B' was looking for an opportunity to settle scores and once after school he challenged 'A' to a duel and gave him punch on his face with intent to knock out his teeth, but he missed the aim the blow landed on the right eye of 'A' due to which he lost his eyesight in the right eye. Here 'B' would be liable for