Why do Shias beat upon themselves on 9/10 muharram

Re: Why do Shias beat upon themselves on 9/10 muharram

They will call Shia’s Qatilaan-e-Hussain but wont send lanat on Qatiliaan-e-Hussain…Becoz they know lanat comes back to their own door when they say… May ALLAH curse enemies of Ahleybait a.s.