ignachete7 PM'ed me having had a similar catastrophic failure with a Vello Bike+. IMHO, these bikes are deathtraps as sold.
"My girlfriend experience the same thing when has to make an emergency breaking as a result of a massive crash. The folding mechanism when using the front brake it pushes the rear end forward, then the magnetic coupling unlocks and the bike collapsed under her. Could you explain to me how you tied the folding mechanism so it is permanently closed? If possible could you please send me some pictures?"
To stop the Vello Bike+ folding while in use, I used a dyneema loop. They are sold at any climbing store and designed to take massive jolts. By removing the seat post, it is possible to loop it around fairly tightly, and secure the loop where the seatpost fits.
