You are in combat time so who gets there first is initiative. The action of the bulldog will be to ram the bike, Big Jim can eithet jump the bike and try to get it out of the way (if it goes before the rigger) and try to get it out of the way or shot or whatever. If the rigger goes before Big Jim than Big Jim sees what's left of his bike after the van rammed it.
Also Artie Spitfire is currently speeding after the van, and it is even further from the Van, she is not with you and cannot hear you.