In TDKR, we saw Stryver falling through the cracked ice as well. Except, he didn't survived.
HARVEY DENT: Well, fair's fair. [draws coin] Heads I'll take it, tails it's all yours.
RACHEL DAWES Oh yeah? You want to flip a coin to see who leads
TRADER 2: You canít short the stock because Bruce Wayne goes to a party
TRADER 1: Wayne coming back is change. Change is either good or bad.
TRADER 2: On what basis?
TRADER 1: I flipped a coin.
In TDKR, one of the mercenaries was holding and checking at the bat tranquilizing dart while Gordon and his men were sent to the ice.