President Obama and his Chinese counterpart, Hu Jintao, emerged from two hours of talks

Tuesday morning pledging to continue efforts to strengthen the growing partnership between the two countries ，and  to  work  together  to  address  global  challenges  such  as  climate   change,   nuclear proliferation and sustaining the world’s nascent economic recovery.

此句答案解析说 pledging .......句 做整个句子的伴随状语，但pledging前面没有 “，”以示分开，请问这种情况下，红色句子可以视为伴随状语吗？而不是后置定语。