If Tryndamere's controller attacks units with enough excess damage to trigger his ability but doesn't verbally announce or assign the excess damage, does the trigger still happen and grant the point?

Ruling: You must assign all damage including excess damage - you cannot choose not to overdamage. If Tryndamere has at least 5 excess damage after assigning lethal to all defending units, the trigger condition is met and the point should be granted.

Sequence:

• Sum up all attacking units' might
• Assign damage to defending units until each reaches lethal
• Any remaining damage beyond lethal to all units is excess damage
• Excess damage is automatically assigned to the last unit
• If 5+ excess damage exists, Tryndamere's trigger condition is met

Nuances:

• Whether a player who forgets to announce or take the point from the trigger can claim it retroactively depends on competitive penalty guidelines that don't yet exist
• The trigger itself is not optional - the condition is automatically met when 5+ excess damage occurs
• In casual play, the point should be given even if not announced