There are two different formulas for calculating bulls and bears, the standard version, uses Highest and Lowest of prices in a given period, BUT, the version we have in meta trader platform, uses the current high and current low for each bar.
Within this indicator, you can use the standard version or the meta trader version, it will draw both bulls and bears and you can turn each one on and off in the style section.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.