- Borussia Dortmund defeats Tottenham in Europa League
- German side wins first leg of last-16 encounter 3-0
- Pierre-Emerick Aubameyang and Marco Reus on target
- Return fixture in London next week
(CNN)Dressed in black and yellow and with the sting to match -- Pierre-Emerick Aubameyang proved why he's one of the most lethal in the business.