You are assuming the hunters have cover and the warlocks and titans are just in an open field picking flowers or some shit...
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Hunters invis and stealth behind everyone and slit there throats
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Even if they all have cover, the hunters are the best at using it and moving stealthily through it, so they will have a major advantage in that terrain.
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Having armor made for a tank and self-Rez makes you a bit cocky......