An ordinary win
Suppose 100 units are placed on Dragon. Dragon receives 9 and Tiger receives 5, so Dragon wins. At 1:1, the profit is 100 units and the original 100-unit stake is returned, giving a total return of 200.
Total return and profit are different amounts. Calling the 200-unit return a 200-unit profit would count the original stake as profit. If Tiger had the higher card instead, the 100-unit Dragon wager would lose.
A separate calculation for a tie
Now suppose the same 100-unit Dragon wager is followed by a queen on each side. Under the common half-loss rule, 50 units are lost and 50 returned. Neither main side is higher, but the whole stake is not refunded.
A Tie wager is a separate decision with its own payout. This example cannot calculate its profit. Likewise, several earlier Dragon wins do not establish that either Dragon or Tiger must win the next round.