easier part first:
TW. pg. 39
If, prior to any pair of movement or attack declarations, one
team has at least twice as many units left to declare for as the
other team, the team with twice as many units declares for
two units rather than one.
meaning, in our case
Round | Attacker Units | Defender Units | Attacker Moves | Defender Moves |
1 | 2 | 3 - doesn't have double the units | 1 | 1 |
2 | 1 | 2 - does have double the units | 1 | 2 |
In each round we move as dictated by initiative, so:
A 1 D 1 -> A 1 D2
that means I move now, but the move depend on our discussion.
now the other part
Whitworth is undamaged (that can change, but it's not going to be crippled barring some lucky shots) if he gets damaged (most probable outcome) I'll need to pay 30 WP to repair him, if you cripple him it'll be 45 WP. I need three round to escape via attacker side with +3/+4 defense.
Mongoose can escape in two rounds with even higher defense. It already need 15 WP repair, and quite possibly can get into 30 WP for crippled status. though it usually have some +4/+5 defense.
I'll get 75 WP for achieving the primary goal. So it is worthy to roll around even at the cost of 60 WP.
catching that assassin is unlikely, but possible. chasing him however when all depend more on a roll than on tactic is not very interesting. So I'll opt for retreat and we can play next track.
Now. I truly think, that we should follow the rules I quoted - there are no penalty for illegal moves to mechs regarding further tracks. Becoming lost is an issue for current track, without further consequences. I might agree on disabling the mech for next track limiting my options for next track on choosing the mechs, but anything above that is unnecessarily harsh IMO.