At specific issue is a confrontation from January 13 when Bush and her staff encountered Greene without a mask and talking into her phone in the tunnel between the Cannon Office Building and the Capitol.

句子没错。without a mask 和 talking into her phone，分别作定语修饰 Greene（格林）。

一个是介词短作定语（戴着口罩的），一个是现在分词作定语（对着手机说话的）。现在分词作定语表示主动和进行，改为过去时就不是定语，而是谓语动词，不可以。

 Bush and her staff （主）encountered （动）Greene （宾）without a mask and talking into her phone.（定）