Electronic – What’s the current leak path of the electrostatic discharge during an EMC test

When we develop a new product we need to pass the EMC test,I really wonder what's the current path during a electrostatic discharge test.
Here is the test situation：

1. Q1:
   If the EUT(equipment under test) is metal shell,is there a discharge path? If yes,what's the path going to? the ground?
   Q2

2. Q2:
   If the EUT is not metal shield(for example plastic shell),is there a path exist? and what's the discharge path?

Let's assume the EUT is a battery powered plastic shell device which have a PCB inside. When we do the electrostatic discharge test at a voltage of +-6.6kV , the discharge current do have an influence on the device such as cause it to work abnormal,so what's the discharge current path?

[updated]
I add a new picture to assume the discharge current loop,that is my confusion.

Can I always find the discharging current loop in my test?

Q1 is easy to consider as the discharging current flow through the metal shell
but in the situation of Q2 I cannot find a current path.