In DOTA, you can refer to the following for what the DOTA small vt double combo skills are:
1. During the time when Xiaoxiao throws people from the ground to the sky, V's damage is doubled. The reason why VT has double damage compared to TV is because V's damage judgment is slower than T's during VT. The moment you V, the moment T goes out, even if you don't fly out, the system has already recorded it, and the damage from your V will cause double the result. As shown below.
2. So when we release the second line of Xiao Xiao VT, we must release the t skill first, and then the v skill, so that we can deal double the v damage.