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Desperate cause - Graves gains 5/6.25/7.5/8.75/10% mov. speed and and Quickdraw gains a buff for 10/10/12.5/15/15 seconds. This buff causes Quickdraw, when activated, to deal 10/15/20/25/30 (+1% AD) bonus physical damage for each basic attack. Mov. speed buff lasts for 10 seconds for each rank. Quickdraw can be buffed (if activated) multiple times if its cooldown ends over the course of 10/10/12.5/15/15 seconds.
Note, the damage only lasts 4 seconds (duration of quickdraw's attack speed buff) but if quickdraw goes off cool down, and desperate cause is still active, quickdraw can be activated again, granting the buff again.