The sixth prosomal appendage is modified in both xiphosurids and chasmataspidids for use in locomotion or burrowing.

Hoo wur stonnin' i' th' front of a weshin'-mug, wi' a lin brat afore her.

to get off scot-free

So you aren't deserting the Caversham ship. They'll understand. After all, their courtship was pretty whirlwind itself.