Rules: Get value in node after saving comment

Hello everybody.

I would send an email after saving a comment, with a comparison of a node data.
When you create a new node, you can choose the contact in a list.

I would like when the creator of the node posts a comment, the contact receives this email.

In my Rules:

-EVENT:
After saving a comment

- CONDITION:
None

-ACTION:

If the selected contact is "person 1" then sent email person1@support.com

My problem: I do not find the value of the contact in my node.
I would like to retrieve this information: [comment: node: field_contact]

Thank you for your help.