If the Engineer's sentries dont go away when he dies...

Howcome the Demoman's stickybombs do?

Because the stickybombs depend on the detonator to be activated... which was being carried by the dead Demo.  If your sticky bombs stayed... you wouldn't have the detonator on you to blow them up anyway.

SGs are self sufficient - they don't require the Engy to activate it everytime by using a trigger that's carried as part of his inventory.

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Oops... I thought the SGs blew up when the engineers died, cause i saw this video of the engi's dispenser blowing up after he was backstabbed by a spy.

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Probably got sapped. If they blew up, all we'd have to do is backstab the engy. It'd make it too easy for spies.

At least this way he's out for a while, so you can sap his sentry before he respawns. But it's kind of hard to stab an engy if he's near his sentry.

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the perfect answer

So why cant you detonate them when you respawn again...

they should atleast detonate when you die.   instead of vaporize

Yepp You have to keep alive if you want the DSitcky explode when a player pass.

They should blow up automatically when the demo dies.

If they detonated when the demo dies, there is a chance that he will get a kill and thus 1 pt for dying essentially. Doesnt make much sense score wise.