那位刽子手在执行死刑前感到巨大的心理压力。

The ___executioner felt tremendous psychological pressure before carrying out the death sentence.

项目经理成了裁员计划的执行者，冷酷地解雇了三分之一的员工。

The project manager became the ___executioner of the layoff plan, ruthlessly dismissing one-third of the staff.