no.. it does not work this way... it does not double up.. its just makes the probability increase.. by the meaning.. if somehow the 1st basher makes the bash.. and the 2nd basher makes the bash at the same time.. oni 1 bash will appear..

so it does not really double ur chances.. in other words not multiplied.. it just like creating another probability that it might have a chance activate..

this goes same for PA who buy burize.. if PA's ulti somehow activates.. and the burize crit activates, it will take the larger damage..

thats how it works..hope this help clarify ur thoughts

cheers.. oh.. do correct me if i am wrong though..