Exhibit A, an instalock duelist who rushes into the site with a mobility skill (dash, tp, satchel, etc) eventhough smokes haven't been deployed, angles haven't been cleared, and the enemy is watching the entry angle and delaying all kinds of push from your team to back the duelist and they die to the first enemy they encounter.

or

Exhibit B, an instalock duelist who waits at the back of the pack for flanks until all manner of utility has been expended from both teams. Smokes have disappated and mollys have burned up. They will stay behind until something happens and would usually be the last one alive to clutch up the round.