Merge Archon via trigger

[Kaese]

Hi,

I need two High Templars to merge into an Archon via trigger but I can't get it to work. I made the owner of the Templars select them and then issue the order "High Templar - Archon Warp" to the selected units but nothing happened. I also tried to issue the order to just one of the Templars but again without result. Maybe you can help me.

Thanks in advance.

Edit: Never mind. After some excessive testing I finally figured it out. Apparently the only way it works is if you add both Templars to a unit group and then use "Issue Order To Unit Group" with "High Templar - Archon Warp - Selection" being the order.