Well, except for the method i posted before you also can use delay. Just calculate the time that is going to pass before switching to pose 4 and set the timer for that time to show speech bubble and to start another timer that will hide it.Sure there is!
But if you're suggesting this for what I'm aiming for unfortunately it doesn't have the event options in it to do what I want!
For example: if poses 1, 2, 3 and 4 are going for 30 seconds each then you need to set first timer for 90 seconds and second timer (one that activated by the first one) for 30 seconds.