Hi @tbiggar, good question. @coafer has provided some good info there 
Each element can have one interaction assigned:
If you want to trigger multiple actions from a single element, then you would add additional triggers, affecting either the selected class or a different class:
Using the second method with additional triggers, you could for example, create a button that triggers a pop out window with instructions or CTA, and the a second trigger that targets the footer to slide in.
When adding multiple triggers, the triggers are executed in order they appear in the list of triggers defined in the interaction. Each trigger can have multiple steps.
I hope this helps, let us know if you have any further questions on that