Do your two circles if you foul someone

RULE 

Part 4 - Other Requirements When Racing

Rule 44.2  After getting well clear of other boats as soon after the incident as possible, a boat takea One-Turn or Two-Turn Penalty by promptly making the required number of turns in the same direction, each turn including one tack and gybe.  When a boat take the penalty at or near the finishing line, she shall sail completely to the course side of the line before finishing.

Buoy room rules do not apply at a starting mark surrounded by navigable water or at its anchor line from the time boats are approaching them to start until they have passed them... 

PURPOSE

Protect the rights of the virtuous boat.