You do your best damage up front and by emptying your ammo clip straight into an enemy Hero - keep the left mouse button held down to empty the clip in about a second. Go for burst, and be ready to escape to safety by making use of your amazing mobility advantages.
Note that Tracer's Ultimate Pulse Bomb Ability can actually be attached to an enemy Hero, which is sure to guarantee all but the hardiest Heroes leave the battlefield with a bang. Consider Blinking in to a heavy tank Hero, dropping your Ultimate directly on them, and then rewinding time so you get away from the heat that's about to come your way.
Try to aim Tracer's pistols at the upper area of your target's torso, rather than clean on the head. There's an element of spray to the way these weapons fire, and so aiming in this way actually increases your odds of taking your victim down.
Recall's not just good for getting you out of trouble, or restoring some health and ammo, it can also be used to remove negative debuffs. Think of the damage-over-time effects of Venom Mine, or the annoyance of Zenyatta's Orb of Discord.
As a general rule of thumb, when you start taking damage you should Blink anywhere you feel safer to be. This effectively resets the pace of the battle, and gives you the upper hand - you, after all, know where you are! For this reason, it's worth making sure you have at least one Blink left in the bank before charging recklessly into battle.
Great though she is for harassing enemy Heroes and bursting down soft targets, Tracer really shines at reaching hard-to-reach and bothersome units such as turrets or Bastion when he's in his heavy-artillery mode. You can also use Tracer's mobility skills to sneak behind protective shields.
While you cannot use Blink to bypass Mei's Ice Wall, you can use it to avoid detonating the mines and traps left behind by the like sof Junkrat and Widwomaker. Worth keeping in mind - particularly if you're focused on taking out the latter.
Tracer herself will take damage from Pulse Bomb when it detonates. It falls quite hard to the floor so if you need to throw it forwards, trying aiming up a little. There's only around two seconds until the detonation goes off, so it pays to practise with this Ultimate.
Most players will do their utmost to get away from Pulse Bomb before the detonation goes off. This means it's ideally used in conjunction with a mobility-impairing Ultimate from a teammate such as Mei or Zarya.
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