[jwiz]

He says in his comment that they inject the urine, then, a few days later, they kill the rabbit.

[jibal]

Those weren't his words, and his actual words (which he quoted above, acknowledging their ambiguity) could be (mis)read as meaning that injecting the urine killed the rabbit a few days later, especially since he also wrote "apparently [frogs] could survive the urine injection".

[tdeck]

I do still find it odd that injecting urine into the frog repeatedly is OK for the frog, but perhaps the volume was quite small.