In a sudden death round last night, picked up the spark after a teammate dropped it right in front of the enemy rift. Picked it up and walked through the rift several times with the spark buff active, but the dunk animation never played. It ended up costing us the win, which sucked.
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I saw that happen; if the Spark gets dropped really, really close to the Rift, and a player picks it up he can't dunk right away, he has to run a little far from it then back to make it work.