Question:
Based on the premise "With a single jerk the armored man's head tore free.", can we conclude that "The man's head, sliced by a sword, tore free without a single jerk."?
****
Answer:
it is not possible to tell

Question:
Based on the premise "Then you must know where you found it?", can we conclude that "So you're saying you, in fact, did not find it?"?
****
Answer:
no

Question:
Based on the premise "The two squares are separated by the 12th-century cathedral and 13th-century octagonal baptistery.", can we conclude that "There are two squares divided by a cathedral and a baptistery."?
****
Answer:
yes