处理投诉时起冲突，西安一保安竟咬断业主手指，保安公司回应

Group 1 - The incident escalated from a minor neighborhood issue to a violent confrontation between a security guard and a resident, resulting in the resident losing a finger [1][3] - The resident, Mr. Dang, was confronted by a security guard over items he had placed in the hallway, leading to a physical altercation where the guard bit his finger [3][5] - The security guard involved was identified as a third-party contractor from Xi'an Dadu Hui Security Service Co., Ltd., which stated that they bear some responsibility for the incident [7][9] Group 2 - The security company acknowledged that the guard was not on duty that day but acted out of concern for the resident's items in the hallway, indicating a potential issue with their hiring practices [7][9] - The property management company claimed that the security guard was not their employee, distancing themselves from the incident while also being recognized as having some responsibility [5][9] - The local police are currently investigating the incident, and further discussions will take place among the injured party, the security guard, the labor company, and the property management [9]