surely you can survive 2 minutes within the red circle while trolls are spending a minute to figure which basic wall defense they should hit.

to tweak this stategy im looking for info on how far outside base perimeters invasions may spawn, will they always spawn outside? or is there chance they will spawn inside if my perimeter is huge and the red circle is in middle of it? i did have one of the surtling guys mystically appear inside my main house after i finished event, pretty much where i was when event started. it cant have entered by normal means as fence is 100% and unlike other things that can enter through my port, surtlings cant take the water way.