Uhm, let me think about it. An enemy build one treb near your spawn and shoots towards it, ok. Not nice, but anyway. A treb can shoot once every like 10 seconds or 15 seconds depending on the distance. The hit radius of the projectile is perhaps 900? 1000? That means you cannot be as fast to run this small distance in 10 seconds?
Even the slowest classes can do that, while being crippled. Why not just walk out, and let this ... "very bored juvenile boy who has surely nothing else for his happiness" respawn. And in addition there are siege blockers.