Inalchuq was quite the guy. He knew what the Mongols did to cities that did not surrender and to governors of those cities yet stubbornly decided to resist all the way, despite being outnumbered quite heavily. The siege lasted for 6 months - and was probably the stiffest resistance the Mongols faced till then. It only ended because traitors within the garrison opened the gates to the Mongols eventually. Even then, Inalchuq refused to surrender, retreating to the citadel and still resisting and causing mass casualties to the Mongols. When the citadel eventually fell, he refused to commit suicide and personally threw bricks etc at the advancing mongols to the bitter end. Ironically, it's likely this was all because of a misunderstanding - the Mongol ambassador called him Inalchuq instead of Ghayir Khan, his formal name, and this pissed him off.