It's not just the tower you have to worry about. Always assume that help is on the way if you are gaining ground on the enemy. The other team communicates just as much as your team so don't think that just because someone is alone that they'll be alone for very long. This mistake permeates throughout the lower tiers of Ranked Matchmaking. Greedy stat obsessed players will seek any opportunity for kills and blindly rush to a lone support. The support, of course, is bait. The rest of the team is lurking in the fog, waiting for the moment to strike. Any good team will take advantage of players who chase heroes for long stretches of the map. You may think that a hero with low health is worth the chase, but if it looks too good to be true, it probably is. Many heroes can snowball out of control by picking off stray heroes taking the bait. Like tower diving, it can pay off to play it safe sometimes. Missed opportunities for kills always bring disappointment, but keep in mind that a game of Dota 2 takes a fairly long time and there are going to be plenty of chances to kill your enemies.
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