gear problem

[new gas gas]

my brother was on my ec 250 and had to stop he pulled clutch but seal must have went in slave cyilinder clutch did not work he slammed on back brake engine cut out and back wheel locked up now it is near impossible to get into neutral and when u do and start it up it runs for a few secs then seems to jump in to gear and when u push it in neutral it make a crunching noise then back wheel locks up someone told me maybe gear selector is gone or gearbox problem is it difficult to change gear selector