The [Gnomish Army Knife] item has the ability to resurrect people.
Well, as you , engineers know, it sometimes does not resurrect the person but causes the 30 minute cooldown. I have found a clever bug today, and I though i'd share it with you all.
When you resurrect someone and it doesnt work, just trade to another engineer (or another person, not sure, haven't tested with non-engineers) and the cooldown will dissapear, so you can switch around til you rez the person!