Just stay behind the box and use the first 10 seconds to destroy them...
Absolute non issue.
English
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And then after the man cannons, you get your second one and then in the open area you have 2 more (one Thrasher and a troop transport with Nasty Gun turret that you can maybe shoot off it), then in the Boss area, you get 1 more thrasher and then a troop transport with Gun turret. So that's 3 Thrashers and 2 Gun turret Troop Carriers that can still one hit kill you.
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I'm sorry but if you can't even spell the name of the thing shooting at you then I'm assuming you don't even look at it long enough to see the name correctly. Stop ignoring the THRESHERS and maybe they'll stop killing you.