If you're trying to call DBM's pull command from a button, you can use their slash function directly:
This will call the default 10 seconds:
SlashCmdList.DEADLYBOSSMODSPULL()
This will call the 6 seconds you want:
SlashCmdList.DEADLYBOSSMODSPULL(6)
Same with /break as well:
SlashCmdList.DEADLYBOSSMODSBREAK()
(break's number is in minutes)