Beam struggle; (not tested, initial thoughts)

Extended Clash. This optional rule can help replicate anything from two large energy attacks pressing against each other to two sword wizards locking blades and trying to push each other away to make a decisive follow up.

When two attacks clash as per the usual rules, compare the threshold successes to the loser’s defence. If it is lower, the winner gains a number of initiative equal to the difference and struggle continues for another round, if it is higher the winner’s attack pushes through with all the usual results...