dude, first of all was the guy who put the case on you a qatari?..
even if he is,did he actually tell the cops(in his statement) that you tried to attack him with the cutter..i hope your statement clearly says that its something from your workplace n that it fell from ur pocket..you/he can argue that in frnt of the judge whn they ask you..the middlefinger they dont like here....,looking at the bail amount you put up,3000rials..i guess they(the public prosecution) have left it to the judge at court to decide ur punishment..
But i think if you do make it clear when ur called to court again,n asked to speak try n impress on the judge the fact that u dint actually attack him,.
I'm hoping they let you off with the bail amount as a fine..cos basically in the end its your word against his..(any witnesses?)..also remember that if you feel the judgement is harsh,you have the right to appeal the verdict..(check with a better source than me)but i think its possible..All the best..Hope its a light punishment if ur crime is just the middle finger..LOL..