Nothing tracks around corners. Fusion grenades I know nothing about, so won't go into that debate. I've missed plenty of shots in PVE with ghally because they tread behind a thin board. And wolf pack rounds scatter with only very few hitting them. And none hitting them when it's a full wall.
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lol next time you inn pve just go shoot the ground anywhere near any enemis and watch your wolf pack rounds. "track" the nubs it's pretty cool to see