Firslty, disciplinary committee is not the court of law who can issue warrant against any person.
Secondly, if they happen to love to court for further adjudication then a chance would be there for you to appear.
Thirdly, one or two instances only bailable warrant has been issued to the witness, if he still doesn’t come then a non bailable earrant where you might have to abscond and apply for Ancipitary Bail.