For defense, do you ever walk down ellbow or mid? I found success doing it, especially on eco. Also, if you clear B main you can backtrack and jump on the wall angle towards bottom mid/A site.
depending how good u are with the headhunter, only the first 3 rounds matter. round 1: 4 bullets + trip round 2 (win): max bullets and heavy shield round 2 (loss): light shield + bullets till minimum 3500 round 3 (bonus): just max bullets and shield again. round 3 (team buying): buy rifle round 3 (team saving): same as round 2 basically. Personally i dont awp unless i have to, so ill rifle until i can buy awp naturally as you normally would. If you want to save for awp you can just do bullets and shield until u have enough. If u cant kill ppl with the deagle this strategy will be hard. So play to your strength and weaknesses.
