Final answer:
The question does not provide enough information to determine who partnered up with Death according to the rioters in the poem.
Step-by-step explanation:
The question refers to a poem that mentions Death as a character. However, the specific partner of Death is not mentioned in the provided information. The poem raises the question of whether Death is causing further harm by killing additional people after a son and mother have already been slain. So, it can be said that the rioters in the poem believe that Death is continuing to kill more people. However, without more information, it is not possible to determine if the rioters believe that anyone partnered up with Death.