I got mine through Rumble I came first and was surprised it was my 3rd exotic I'd ever gotten 1rst was a plan c off of xur second was hard light from vanguard rok the psion flayers mission on mars. I won't say I earned any of those RNG's a fickle wench and the guy who joined when one of the others quit could've just as easily been Gjallahorned.
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I got P&T as a purple engram drop during my first day playing in the last IB. It was my first dropped exotic. Everything else was from exotic bounties or from Xur.