1 Open up the map you want in dothalo
2 Go to the effect tag and for gemini click on battery_explosion and for containment click on the fusion core exposion
3 In the dependencies window of the explosion you selected under the bloc tags change them to anything else but make one of them a sticky grenade
4 Go to the proj tag and click on the plasma grenade and in the dependencies window there will be 3 effe tags
5 For the second 2 effe tags change them to the explosion you want from step 2 either the battery_explosion or the fusion core explosion and save changes
When the barrel explodes the 3 items pop out and one is a sticky and that stick initiates the explosion again sending the 3 items out again created a chain spawn
u can do this on any map just get headlong and drag the battery over to the map u want