Indeed Batman had not many other choices to save everybody.Using the throwing blades from his gauntlets would have been too dangerous, he could've hurt Gordon's son in the process, and he knew Two-Face was on a rampage, he had to act fast, despite the risks.Anyway I'm highly disappointed, they briefly introduced a great villain in a great manner just to remove him from the franchise so fast we couldn't fully enjoy it.I hope this is a commercial move and like 1 week before the release of the third movie they'll publish a teaser poster wich says something like:
"There's always another face of the medal" or "Half-Dead, Half Alive, Twice Deadly" with TF in the shadows armed with guns.