A duelist might be able to carry Tass into a certámen match in order to refuel the Locus during the duel. If the terms of the match forbid refueling, however, that extra Tass would be considered cheating. In many matches, though, that little extra edge is quite traditional – Hermetic wizards used to do it all the time back in the old days.

Refueling takes one turn, and requires Prime 2 or better. A normal Prime 2 Effect must be cast in order to draw the Quintessence from that Tass. (For details, see the Prime Sphere entry in Mage 20, pp. 520-521) The roll involved is difficulty

6, and each success moves one point of Quintessence into the Locus. Technically, you could refuel from the Chantry’s Node during a duel; this, however, is extremely bad form and usually leads the Marshalls to cancel the duel and chastise the offender.