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Thing type 403, Force Shield Monitor, is a monitor that gives the player the Force Shield upon its destruction. Unlike other shields, this shield protects the player from two hits. On the first hit, the shield will become lighter. On the second hit, it will disappear completely. When a player with this shield presses the Spin button in mid-jump, their momentum will reset completely, and they will fall in the direction gravity is facing while in a jump state. This ability is useful for careful, precise platforming.
While this monitor gives the player a Force Shield that lasts two hits, the amount of hits the shield will last can be extended past this number using either the actionA_CustomPower, or linedef type 434.
Checking the Ambush flag turns this monitor into a Weak Random Monitor, out of which it may randomly respawn with a probability of 9.38%. Checking the Special flag turns it into a Strong Random Monitor, out of which it may randomly respawn with a probability of 18.75%.
This Monitor type also comes in a gold variation, Thing Type 433, Force Shield Monitor (Respawn), which will give the player the Force Shield once popped, before respawning after about 3 seconds. SRB2 itself does not use the Force Shield Monitor (Respawn), but it is still available for custom maps.