(Nonce k2 of the second signature: k1 / 2 = k2)
Anyone who can calculate will own the 3,500.00 BTCs
You are very confused.
There is no such relationship between the two ks used in the 2 signatures in the 2 transactions that were sent out of 1FvUkW8thcqG6HP7gAvAjcR52fR7CYodBx, I checked. If there were the coins would have been stolen a very long time ago.