Cat's are almost too fast to decide to tack, then complete the tack within the two boat lengths in most wind conditions, ie. the decision is made before you even enter the two boat lengths zone whether you're going to lay the mark or not.

If you leave your decision that late, you deserve to not round first time. Bear away and gybe onto port, tack and then round, also known as bailing out.

If you are the leeward of two boats that are not going to make it, why the hell have you left the decision so late! Bail out and go around properly earlier.

In cat sailing, with high speeds and slow tacks, it is always best to think well ahead and make decisions as early as possible, erring on the side of maintaining speed.